Finding the Fourth Proportional to 142,868.59, 197,160.78 and 78,343.72

Step by Step Solution

1. Step 1: Write the proportion equation
   142,868.59 : 197,160.78 = 78,343.72 : x
2. Step 2: Convert to fraction form
   142,868.59/197,160.78 = 78,343.72/x
3. Step 3: Cross multiply
   142,868.59x = 197,160.78 × 78,343.72
4. Step 4: Simplify right side
   142,868.59x = 15,446,308,943.30
5. Step 5: Solve for x
   x = 15,446,308,943.30/142,868.59
6. Step 6: Final answer
   x = 108,115.50