Finding the Fourth Proportional to 90,710.42, 125,241.46 and 81,120.56

Step by Step Solution

1. Step 1: Write the proportion equation
   90,710.42 : 125,241.46 = 81,120.56 : x
2. Step 2: Convert to fraction form
   90,710.42/125,241.46 = 81,120.56/x
3. Step 3: Cross multiply
   90,710.42x = 125,241.46 × 81,120.56
4. Step 4: Simplify right side
   90,710.42x = 10,159,656,541.41
5. Step 5: Solve for x
   x = 10,159,656,541.41/90,710.42
6. Step 6: Final answer
   x = 112,000.99