Heart Lake Developments sold four laketront lots for $\$ 31,000$ per hectare. If the sizes of the lots in hectares were $2 \frac{5}{8}, 3 \frac{1}{4}, 5 \frac{5}{6}$, and $4 \frac{5}{7}$ iespectively, what was the fotal sales revenue for the four iots?

Step 1 ：Convert the mixed numbers to decimals: \(2 \frac{5}{8} = 2.625\), \(3 \frac{1}{4} = 3.25\), \(5 \frac{5}{6} = 5.8333\), and \(4 \frac{5}{7} = 4.7143\)

Step 2 ：Find the total area of the four lots: \(2.625 + 3.25 + 5.8333 + 4.7143 = 16.4226\) hectares

Step 3 ：Calculate the total sales revenue: \(16.4226 \times $31,000 = $509,101.19\)

Step 4 ：\(\boxed{$509,101.19}\)