Finding the Fourth Proportional to 142,168.62, 196,188.92 and 78,505.06

Step by Step Solution

1. Step 1: Write the proportion equation
   142,168.62 : 196,188.92 = 78,505.06 : x
2. Step 2: Convert to fraction form
   142,168.62/196,188.92 = 78,505.06/x
3. Step 3: Cross multiply
   142,168.62x = 196,188.92 × 78,505.06
4. Step 4: Simplify right side
   142,168.62x = 15,401,822,935.94
5. Step 5: Solve for x
   x = 15,401,822,935.94/142,168.62
6. Step 6: Final answer
   x = 108,334.90