If there are 4 players left in a tourney and the shortest stacks go out on the same hand who takes the third place prize?
The player with the most chips at the beginning of the hand takes 3rd.
On a single table the most chips at the all-in (same betting round) is also the most chips at the beginning of the hand.
On multiple tables beginning of the hand order is not always same as the all-in bet order. Player A could go all in for $100 and player B all in for $200 on the river but player A had more chips at the beginning of the hand.
You cannot just take pot size and divide as some players may have put in chips and folded earlier.