Finding the Fourth Proportional to 142,131.76, 196,142.12 and 78,469.68

Step by Step Solution

1. Step 1: Write the proportion equation
   142,131.76 : 196,142.12 = 78,469.68 : x
2. Step 2: Convert to fraction form
   142,131.76/196,142.12 = 78,469.68/x
3. Step 3: Cross multiply
   142,131.76x = 196,142.12 × 78,469.68
4. Step 4: Simplify right side
   142,131.76x = 15,391,209,390.92
5. Step 5: Solve for x
   x = 15,391,209,390.92/142,131.76
6. Step 6: Final answer
   x = 108,288.32