Finding the Fourth Proportional to 91,997.18, 126,978.46 and 56,217.32

Step by Step Solution

1. Step 1: Write the proportion equation
   91,997.18 : 126,978.46 = 56,217.32 : x
2. Step 2: Convert to fraction form
   91,997.18/126,978.46 = 56,217.32/x
3. Step 3: Cross multiply
   91,997.18x = 126,978.46 × 56,217.32
4. Step 4: Simplify right side
   91,997.18x = 7,138,387,943.49
5. Step 5: Solve for x
   x = 7,138,387,943.49/91,997.18
6. Step 6: Final answer
   x = 77,593.56