Finding the Fourth Proportional to 142,863.20, 197,153.61 and 78,331.10

Step by Step Solution

1. Step 1: Write the proportion equation
   142,863.20 : 197,153.61 = 78,331.10 : x
2. Step 2: Convert to fraction form
   142,863.20/197,153.61 = 78,331.10/x
3. Step 3: Cross multiply
   142,863.20x = 197,153.61 × 78,331.10
4. Step 4: Simplify right side
   142,863.20x = 15,443,259,140.27
5. Step 5: Solve for x
   x = 15,443,259,140.27/142,863.20
6. Step 6: Final answer
   x = 108,098.23