Finding the Fourth Proportional to 39,978.52, 55,403.70 and 39,414.76

Step by Step Solution

1. Step 1: Write the proportion equation
   39,978.52 : 55,403.70 = 39,414.76 : x
2. Step 2: Convert to fraction form
   39,978.52/55,403.70 = 39,414.76/x
3. Step 3: Cross multiply
   39,978.52x = 55,403.70 × 39,414.76
4. Step 4: Simplify right side
   39,978.52x = 2,183,723,538.61
5. Step 5: Solve for x
   x = 2,183,723,538.61/39,978.52
6. Step 6: Final answer
   x = 54,622.42