Finding the Fourth Proportional to 56,503.92, 77,978.60 and 34,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   56,503.92 : 77,978.60 = 34,155.12 : x
2. Step 2: Convert to fraction form
   56,503.92/77,978.60 = 34,155.12/x
3. Step 3: Cross multiply
   56,503.92x = 77,978.60 × 34,155.12
4. Step 4: Simplify right side
   56,503.92x = 2,663,368,440.43
5. Step 5: Solve for x
   x = 2,663,368,440.43/56,503.92
6. Step 6: Final answer
   x = 47,135.99