Finding the Fourth Proportional to 142,311.42, 196,402.20 and 78,661.62

Step by Step Solution

1. Step 1: Write the proportion equation
   142,311.42 : 196,402.20 = 78,661.62 : x
2. Step 2: Convert to fraction form
   142,311.42/196,402.20 = 78,661.62/x
3. Step 3: Cross multiply
   142,311.42x = 196,402.20 × 78,661.62
4. Step 4: Simplify right side
   142,311.42x = 15,449,315,223.56
5. Step 5: Solve for x
   x = 15,449,315,223.56/142,311.42
6. Step 6: Final answer
   x = 108,559.91