Finding the Fourth Proportional to 99,142.80, 148,282.20 and 88,688.40

Step by Step Solution

1. Step 1: Write the proportion equation
   99,142.80 : 148,282.20 = 88,688.40 : x
2. Step 2: Convert to fraction form
   99,142.80/148,282.20 = 88,688.40/x
3. Step 3: Cross multiply
   99,142.80x = 148,282.20 × 88,688.40
4. Step 4: Simplify right side
   99,142.80x = 13,150,911,066.48
5. Step 5: Solve for x
   x = 13,150,911,066.48/99,142.80
6. Step 6: Final answer
   x = 132,646.15