Finding the Fourth Proportional to 72,640.72, 108,952.92 and 20,057.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72,640.72 : 108,952.92 = 20,057.68 : x
2. Step 2: Convert to fraction form
   72,640.72/108,952.92 = 20,057.68/x
3. Step 3: Cross multiply
   72,640.72x = 108,952.92 × 20,057.68
4. Step 4: Simplify right side
   72,640.72x = 2,185,342,804.43
5. Step 5: Solve for x
   x = 2,185,342,804.43/72,640.72
6. Step 6: Final answer
   x = 30,084.27