$$( 4 ) \frac { 1 } { 7 - 4 \sqrt { 3 } }$$
$16\sqrt{3}+28\approx 55.712812921$
$$4\times \frac{7+4\sqrt{3}}{\left(7-4\sqrt{3}\right)\left(7+4\sqrt{3}\right)}$$
$$4\times \frac{7+4\sqrt{3}}{7^{2}-\left(-4\sqrt{3}\right)^{2}}$$
$$4\times \frac{7+4\sqrt{3}}{49-\left(-4\sqrt{3}\right)^{2}}$$
$$4\times \frac{7+4\sqrt{3}}{49-\left(-4\right)^{2}\left(\sqrt{3}\right)^{2}}$$
$$4\times \frac{7+4\sqrt{3}}{49-16\left(\sqrt{3}\right)^{2}}$$
$$4\times \frac{7+4\sqrt{3}}{49-16\times 3}$$
$$4\times \frac{7+4\sqrt{3}}{49-48}$$
$$4\times \frac{7+4\sqrt{3}}{1}$$
$$4\left(7+4\sqrt{3}\right)$$
$$28+16\sqrt{3}$$
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