$$5 \frac{ 5 }{ 7 } 7 \sqrt{ 7 } 40$$
$1600\sqrt{7}\approx 4233.202097703$
$$280\times \frac{5\times 7+5}{7}\sqrt{7}$$
$$280\times \frac{35+5}{7}\sqrt{7}$$
$$280\times \frac{40}{7}\sqrt{7}$$
$$\frac{280\times 40}{7}\sqrt{7}$$
$$\frac{11200}{7}\sqrt{7}$$
$$1600\sqrt{7}$$
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