Finding the Fourth Proportional to 142,103.72, 196,104.50 and 78,440.15

Step by Step Solution

1. Step 1: Write the proportion equation
   142,103.72 : 196,104.50 = 78,440.15 : x
2. Step 2: Convert to fraction form
   142,103.72/196,104.50 = 78,440.15/x
3. Step 3: Cross multiply
   142,103.72x = 196,104.50 × 78,440.15
4. Step 4: Simplify right side
   142,103.72x = 15,382,465,022.95
5. Step 5: Solve for x
   x = 15,382,465,022.95/142,103.72
6. Step 6: Final answer
   x = 108,248.16