$$-x^3+38x^2-340x+759 = 0$$
Answer
$$ \begin{matrix}x_1 = 3.42575 & x_2 = 8.4958 & x_3 = 26.07845 \end{matrix} $$
Explanation
This polynomial has no rational roots that can be found using Rational Root Test.
Roots were found using qubic formulas.
This page was created using
Polynomial Equations Solver