Finding the Fourth Proportional to 142,301.41, 196,375.59 and 78,639.05

Step by Step Solution

1. Step 1: Write the proportion equation
   142,301.41 : 196,375.59 = 78,639.05 : x
2. Step 2: Convert to fraction form
   142,301.41/196,375.59 = 78,639.05/x
3. Step 3: Cross multiply
   142,301.41x = 196,375.59 × 78,639.05
4. Step 4: Simplify right side
   142,301.41x = 15,442,790,331.73
5. Step 5: Solve for x
   x = 15,442,790,331.73/142,301.41
6. Step 6: Final answer
   x = 108,521.70