Finding the Fourth Proportional to 142,087.15, 196,079.89 and 78,424.51

Step by Step Solution

1. Step 1: Write the proportion equation
   142,087.15 : 196,079.89 = 78,424.51 : x
2. Step 2: Convert to fraction form
   142,087.15/196,079.89 = 78,424.51/x
3. Step 3: Cross multiply
   142,087.15x = 196,079.89 × 78,424.51
4. Step 4: Simplify right side
   142,087.15x = 15,377,469,294.10
5. Step 5: Solve for x
   x = 15,377,469,294.10/142,087.15
6. Step 6: Final answer
   x = 108,225.62