2,4:x= 6:4,5

To find the value of x, we need to use the concept of cross-multiplication.

The proportion given is 2/4 = 6/4.5.

Cross-multiplying gives us: 2 * 4.5 = 4 * x.

9 = 4x.

Now, we need to isolate x by dividing both sides of the equation by 4: 9/4 = x.

Therefore, the value of x is 9/4 or 2.25.