12,7:x=4:1,6

To solve the proportion 12:7 = x:4:1:6, we can cross multiply:

12 * 1 = 7 * x

12 = 7x

Now, isolate x by dividing both sides by 7:

x = 12 / 7 ≈ 1.71

Therefore, x is approximately 1.71 in this proportion.