Hi Usman ,

More than Excel , this a matter of using mathematics.

2E+07 is just 2 x 10 raised to the power 7 i.e. 20000000 ( 2 followed by 7 zeros ).

x^-2.146 is just 1/(x^2.146) ; a number raised to a negative power is 1 divided by the same number raised to the positive power.

Thus y = 20000000/(x^2.146)

This is the same as x^2.146 = 20000000/y = 20000000/60

If you take the logarithm or the natural logarithm on both sides , you get :

ln(x^2.146) = ln(20000000/60) = 12.7168982692962

ln(a^b) is just b * ln(a) , which in this case means :

ln(x^2.146) is 2.146 * ln(x).

Hence 2.146 * ln(x) = 12.7168982692962

ln(x) = 12.7168982692962/2.146 = 5.92586126248656

Hence x = the number e raised to this power ; to get this in Excel , we use :

=EXP(1)^5.92586126248656 which gives us 374.60092619087

Thus your answer is **374.60092619087**

Narayan