Finding the Fourth Proportional to 103,900.18, 156,131.64 and 56,550.28

Step by Step Solution

1. Step 1: Write the proportion equation
   103,900.18 : 156,131.64 = 56,550.28 : x
2. Step 2: Convert to fraction form
   103,900.18/156,131.64 = 56,550.28/x
3. Step 3: Cross multiply
   103,900.18x = 156,131.64 × 56,550.28
4. Step 4: Simplify right side
   103,900.18x = 8,829,287,958.86
5. Step 5: Solve for x
   x = 8,829,287,958.86/103,900.18
6. Step 6: Final answer
   x = 84,978.56