**P, Q, R**and

**S**with

**P**<

**Q**<

**R**<

**S**are such that

**P, Q**and

**R**(in this order) are in arithmetic sequence and

**Q, R**and

**S**(in this order) are in

**harmonic sequence**.

Given that

**S - P = 19**, determine all possible quadruplet(s)

**(P, Q, R, S)**that satisfy the given conditions.