Finding the Fourth Proportional to 88,406.48, 131,958.82 and 81,019.28

Step by Step Solution

1. Step 1: Write the proportion equation
   88,406.48 : 131,958.82 = 81,019.28 : x
2. Step 2: Convert to fraction form
   88,406.48/131,958.82 = 81,019.28/x
3. Step 3: Cross multiply
   88,406.48x = 131,958.82 × 81,019.28
4. Step 4: Simplify right side
   88,406.48x = 10,691,208,586.05
5. Step 5: Solve for x
   x = 10,691,208,586.05/88,406.48
6. Step 6: Final answer
   x = 120,932.41