Rewrite the square root of the division $\sqrt{\frac{91}{27}}$ as the division of square roots $\frac{\sqrt{91}}{\sqrt{27}}$.
$$69\times \frac{\sqrt{91}}{\sqrt{27}}$$
Factor $27=3^{2}\times 3$. Rewrite the square root of the product $\sqrt{3^{2}\times 3}$ as the product of square roots $\sqrt{3^{2}}\sqrt{3}$. Take the square root of $3^{2}$.
$$69\times \frac{\sqrt{91}}{3\sqrt{3}}$$
Rationalize the denominator of $\frac{\sqrt{91}}{3\sqrt{3}}$ by multiplying numerator and denominator by $\sqrt{3}$.
