$$3 \frac{ 4 }{ 7 } 4 \sqrt{ 4 }$$
$\frac{200}{7}\approx 28.571428571$
$$4\times \frac{21+4}{7}\sqrt{4}$$
$$4\times \frac{25}{7}\sqrt{4}$$
$$\frac{4\times 25}{7}\sqrt{4}$$
$$\frac{100}{7}\sqrt{4}$$
$$\frac{100}{7}\times 2$$
$$\frac{100\times 2}{7}$$
$$\frac{200}{7}$$
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$\frac{2 ^ {3} \cdot 5 ^ {2}}{7} = 28\frac{4}{7} = 28.571428571428573$
