Hey there!

Given,

H.C.F of two numbers = 28

L.C.M of two numbers = 540

One number = 108

We know,

H.C.F * L.C.M = one number * other number

28 * 540 = 108 * other number

(28 * 540) / 108 = other number

140 = other number

or, other number = 140.