Finding the Fourth Proportional to 115,499.20, 159,361.68 and 65,188.48

Step by Step Solution

1. Step 1: Write the proportion equation
   115,499.20 : 159,361.68 = 65,188.48 : x
2. Step 2: Convert to fraction form
   115,499.20/159,361.68 = 65,188.48/x
3. Step 3: Cross multiply
   115,499.20x = 159,361.68 × 65,188.48
4. Step 4: Simplify right side
   115,499.20x = 10,388,545,689.45
5. Step 5: Solve for x
   x = 10,388,545,689.45/115,499.20
6. Step 6: Final answer
   x = 89,944.74