The initial velocity v_i required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius…

The initial velocity $\displaystyle v_i$ required to project a body vertically upward from the surface of the earth to reach a height of 10R, where R is the radius of the earth, may be described in terms of escape velocity $\displaystyle v_{\mathrm{e}}$ such that $\displaystyle v_i=\sqrt{\frac{x}{y}} \times v_{\mathrm{e}}$. The value of $\displaystyle x$ will be \_\_\_\_.