What should come in place of the question mark '?' in the following number series?56, 84, ?, 189, 283.50, 425.25

In the following number series the pattern we observe is:

Any number = 1.5 × (previous number)

For example: 84 = (56 × 1.5)

283.5 = (189 × 1.5)

425.25 = (1.5 ×283.5)

So, for ‘?’ we can observe:

? = 1.5 × 84

⇒ ? = 126

For confirmation we can check if 189 can be obtained from 126 in similar fashion.

i.e., 189 = 126 × 1.5