Mr. X is on the right of Mr. Y and on the left of person in the centre i.e. Y, X, ---
Mr. P is on the right of Mr. Z and Mr. R is on the right of Mr. P i.e. Z, P, R.
R is second from the person sitting in the centre.
So, the order is Y, X, Z, P, R.
Clearly, Z is sitting in the centre.