Finding the Fourth Proportional to 5,123.73, 7,070.63 and 2,855.10

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.73 : 7,070.63 = 2,855.10 : x
2. Step 2: Convert to fraction form
   5,123.73/7,070.63 = 2,855.10/x
3. Step 3: Cross multiply
   5,123.73x = 7,070.63 × 2,855.10
4. Step 4: Simplify right side
   5,123.73x = 20,187,378.30
5. Step 5: Solve for x
   x = 20,187,378.30/5,123.73
6. Step 6: Final answer
   x = 3,939.98