\[b_{1} = 2\sqrt{3};\ \ q = \sqrt{3}:\]
\[S_{5} = \frac{2\sqrt{3} \cdot \left( \left( \sqrt{3} \right)^{5} - 1 \right)}{\sqrt{3} - 1} =\]
\[= \frac{2\sqrt{3} \cdot \left( 9\sqrt{3} - 1 \right)}{\sqrt{3} - 1} =\]
\[= \frac{54 - 2\sqrt{3}}{\sqrt{3} - 1} =\]
\[= \frac{2 \cdot \left( 27 - \sqrt{3} \right)\left( \sqrt{3} + 1 \right)}{\left( \sqrt{3} - 1 \right)\left( \sqrt{3} + 1 \right)} =\]
\[= \frac{2 \cdot \left( 27\sqrt{3} - 3 + 27 - \sqrt{3} \right)}{3 - 1} =\]
\[= 26\sqrt{3} + 24.\]