logarithm

For a real number x > 1, $\frac{1}{\log_2 x} + \frac{1}{\log_3 x} + \frac{1}{\log_4 x} = 1$. The value of x is

If $$\log_x\left(\frac57\right)=\frac{-1}3$$, then the value of x is