Finding the Fourth Proportional to 142,350.72, 196,428.96 and 78,678.24

Step by Step Solution

1. Step 1: Write the proportion equation
   142,350.72 : 196,428.96 = 78,678.24 : x
2. Step 2: Convert to fraction form
   142,350.72/196,428.96 = 78,678.24/x
3. Step 3: Cross multiply
   142,350.72x = 196,428.96 × 78,678.24
4. Step 4: Simplify right side
   142,350.72x = 15,454,684,857.83
5. Step 5: Solve for x
   x = 15,454,684,857.83/142,350.72
6. Step 6: Final answer
   x = 108,567.66