Finding the Fourth Proportional to 5,123.31, 7,686.79 and 2,528.07

Step by Step Solution

1. Step 1: Write the proportion equation
   5,123.31 : 7,686.79 = 2,528.07 : x
2. Step 2: Convert to fraction form
   5,123.31/7,686.79 = 2,528.07/x
3. Step 3: Cross multiply
   5,123.31x = 7,686.79 × 2,528.07
4. Step 4: Simplify right side
   5,123.31x = 19,432,743.20
5. Step 5: Solve for x
   x = 19,432,743.20/5,123.31
6. Step 6: Final answer
   x = 3,793.01