Finding the Fourth Proportional to 142,086.71, 196,081.29 and 78,424.56

Step by Step Solution

1. Step 1: Write the proportion equation
   142,086.71 : 196,081.29 = 78,424.56 : x
2. Step 2: Convert to fraction form
   142,086.71/196,081.29 = 78,424.56/x
3. Step 3: Cross multiply
   142,086.71x = 196,081.29 × 78,424.56
4. Step 4: Simplify right side
   142,086.71x = 15,377,588,892.48
5. Step 5: Solve for x
   x = 15,377,588,892.48/142,086.71
6. Step 6: Final answer
   x = 108,226.79