Finding the Fourth Proportional to 142,389.59, 196,480.46 and 78,718.73

Step by Step Solution

1. Step 1: Write the proportion equation
   142,389.59 : 196,480.46 = 78,718.73 : x
2. Step 2: Convert to fraction form
   142,389.59/196,480.46 = 78,718.73/x
3. Step 3: Cross multiply
   142,389.59x = 196,480.46 × 78,718.73
4. Step 4: Simplify right side
   142,389.59x = 15,466,691,887.42
5. Step 5: Solve for x
   x = 15,466,691,887.42/142,389.59
6. Step 6: Final answer
   x = 108,622.35