Finding the Fourth Proportional to 142,105.72, 196,107.26 and 78,442.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,105.72 : 196,107.26 = 78,442.15 : x
2. Step 2: Convert to fraction form
   142,105.72/196,107.26 = 78,442.15/x
3. Step 3: Cross multiply
   142,105.72x = 196,107.26 × 78,442.15
4. Step 4: Simplify right side
   142,105.72x = 15,383,073,732.26
5. Step 5: Solve for x
   x = 15,383,073,732.26/142,105.72
6. Step 6: Final answer
   x = 108,250.92