Lets suppose piston x has area of a and the y has area of cross section at which force F1 is applied on piston x which provides force F2 on piston y.
According to pascals law , pressure at the two ends is equal, i.e
F1/ A1 = F2 / A2
F2 = F1 *A1/A2
According to given figure, A2 < A1 so A2/ A1 <1