1:4:7...total = 12
1/12 = Joe
4/12 = thea
7/12 = taylor
1/12 * 1,600,000 = 133,333.33 -- Joe's share
4/12 * 1,600,000 = 533,333.33 -- thea's share
7/12 * 1,600,000 = 933,333.33 -- taylors share
------------------------
total = 1,599,999.99 rounds to 1,600,000.00 or 1.6 mil
to buy thea's share, Joe would need $ 533,333.33.
after buying thea's portion, Joe will own (1/12 + 4/12) = 5/12 = 0.416 =
41.6%