Couple of ways to go about this...let's do it the easy way
1/3 lnx + .69315 - 1.0986 =3 Simplify5
1/3 ln x = 3.4055
ln x = 10.164
x = 27346.67
ANOTHER way
ln (((x^1/3) (2)) /3) = 3
(x^1/3 *2)/3 = e^3
x^1/3 = 3/2 * e^3
x = (3/2 * e^3 )^3 = 27347. 9 (difference due to rounding in the first example)