Finding the Fourth Proportional to 142,129.46, 213,305.55 and 99,155.42

Step by Step Solution

1. Step 1: Write the proportion equation
   142,129.46 : 213,305.55 = 99,155.42 : x
2. Step 2: Convert to fraction form
   142,129.46/213,305.55 = 99,155.42/x
3. Step 3: Cross multiply
   142,129.46x = 213,305.55 × 99,155.42
4. Step 4: Simplify right side
   142,129.46x = 21,150,401,398.58
5. Step 5: Solve for x
   x = 21,150,401,398.58/142,129.46
6. Step 6: Final answer
   x = 148,810.82