$$\frac{628}{420}\div\frac{548}{620}\div\frac{748}{668}$$
$\frac{812789}{537999}\approx 1.510763031$
$$\frac{\frac{628}{420}\times 668}{\frac{548}{620}\times 748}$$
$$\frac{\frac{157}{105}\times 668}{\frac{548}{620}\times 748}$$
$$\frac{\frac{157\times 668}{105}}{\frac{548}{620}\times 748}$$
$$\frac{\frac{104876}{105}}{\frac{548}{620}\times 748}$$
$$\frac{\frac{104876}{105}}{\frac{137}{155}\times 748}$$
$$\frac{\frac{104876}{105}}{\frac{137\times 748}{155}}$$
$$\frac{\frac{104876}{105}}{\frac{102476}{155}}$$
$$\frac{104876}{105}\times \frac{155}{102476}$$
$$\frac{104876\times 155}{105\times 102476}$$
$$\frac{16255780}{10759980}$$
$$\frac{812789}{537999}$$
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$\frac{31 \cdot 157 \cdot 167}{3 \cdot 7 \cdot 11 \cdot 17 \cdot 137} = 1\frac{274790}{537999} = 1.5107630311580504$
