Gale - Are you looking to find out what size each "square" should measure after sewing each round? For a 12 " finished" block it will end up as 12.5 unfinished so .....
the first 4 patch unfinished should be 3 1/2"
The second square unfinished should be about 4 3/4"
The next square unfinished should be 6 1/2"
The next unfinished should be 9"
and the last will be 12.5" unfinished