7,2:2,4=0,9:x

To find the value of "x," we can first cross-multiply and then solve for "x".

Cross-multiplying the equation: 7 * 4 = 2 * x

Simplifying both sides: 28 = 2x

Dividing both sides by 2: 28/2 = x 14 = x

Therefore, the value of "x" in the equation 7,2:2,4 = 0,9:x is 14.