Australia set up a winner takes all meeting with New Zealand following their 34-9 victory against Argentina in Mendoza.
The Aussies will now face the All Blacks in Sydney on the 8th August knowing that if they win then they will be Rugby Championship champions for the first time since 2011.
Australia led narrowly 8-6 at half-time but pulled away in the second half to secure the bonus point triumph, thus moving them level with New Zealand on nine points.
Two late tries meant the scoreboard flattered the Wallabies as they ran out comfortable winners against Argentina in The Rugby Championship.
Los Pumas were looking to repeat their famous victory over Australia in Mendoza one year ago but found themselves frustrated, scoring just three penalties from Nicolas Sanchez with very limited try-scoring opportunities.
After a closely contested opening 16 minutes, Australia finally took the lead after a poor Los Pumas clearance went straight to Israel Folau who gained 30 metres before offloading to Bernard Foley.
Foley then unleashed Joe Tomane, who used his blistering pace to score in the left corner, but Foley could not add the extras from a difficult position, 0-5.
Some controversy regarding the try was whether David Pocock had taken out a defender off the ball however; the television replays suggested he never changed his movement.
After half an hour, Nicolas Sanchez finally got Los Pumas on the board when he slotted a simple penalty from in front of the posts.
But at the third time of asking Foley got on the scoresheet with a well-struck penalty two minutes before the break.
Nevertheless, there was still time for more score as Sanchez responded immediately with a penalty of his own to cut the Wallabies lead back to two points as the hooter went for half-time, 6-8.
After the break, the Aussies started quickly, with Foley quickly adding another three points.
And Australia would extend their lead to ten points when replacement lock Dean Mumm crossed the whitewash to score with Foley converting.
However, when viewed again the try should not have been awarded due to a forward pass in the build-up.
The Wallabies were temporarily reduced to 14 men on 66 minutes when a high, late tackle by Cooper led to a yellow card.
But the sin-binning had little effect with the Wallabies finishing strongly as centre Tevita Kuridrani and winger Adam Ashley-Cooper scored tries with Foley converting one to secure the bonus-point victory for the visitors.
Man of the match- Israel Folau
It was another superb performance from the world-class fullback. Although he didn’t score himself he showed himself as a good distributor, setting up Tomane and Ashley-Cooper’s tries with his hard and direct running. His positional play also continues to get better and better.