помогите!!!! по теме пропорция

х : 4/25 = 3/4 : 4/5
4/5х = 4/25 * 3/4
4/5х = 3/25
х = 3/25 : 4/5
х = 3/25 * 5/4
х = 3/5 * 1/4 
х = 3/20

15,04 : 2,688 = m : 26,88
2,688m = 15,04 * 26,88
2,688m = 404,2752
m = 404,2752 : 2,688
m = 150,4