What is the third proportional of $$5x^{2}$$ and $$3xy$$?

A

$$\frac{(9x^{2})}{5}$$

B

$$\frac{(9x^{2}y^{2})}{5}$$

C

$$\frac{(9xy)}{5x}$$

D

$$\frac{(9y^{2})}{5}$$