1+5 = 6,21/6 of the total donation.
1+6 = 7,31/7 of the total donation.
Total donation of four people:148 ÷ (1-1/4-1/7) = 336 yuan.
1 donation: 336× 1/4=84 yuan.
2 Donation: 336× 1/6=56 yuan.
3 Donation: 336× 1/7=48 yuan.