Per Forbes real time billionaires https://www.forbes.com/real-time-billionaires/#4da723683d78

If this ceases to be available then Bloomberg https://www.bloomberg.com/billionaires/

or the most authoritative alternate that can be found.

At date of creation 23 Sep 2023 forbes was showing
1 Elon Musk $486.0 B

2 Larry Ellison $376.9 B

3 Mark Zuckerberg $260.5 B

4 Jeff Bezos $235.2 B

So Musk had just past double the net worth of Jeff Bezos in 3rd place.

If you see double 3rd place being reached please comment, it may be missed and going back to determine when it happened may not be easy enough if there is a long delay before it is pointed out to have happened.