Finding the Fourth Proportional to 87,978.29, 121,313.72 and 65,359.24

Step by Step Solution

1. Step 1: Write the proportion equation
   87,978.29 : 121,313.72 = 65,359.24 : x
2. Step 2: Convert to fraction form
   87,978.29/121,313.72 = 65,359.24/x
3. Step 3: Cross multiply
   87,978.29x = 121,313.72 × 65,359.24
4. Step 4: Simplify right side
   87,978.29x = 7,928,972,400.89
5. Step 5: Solve for x
   x = 7,928,972,400.89/87,978.29
6. Step 6: Final answer
   x = 90,124.20