Finding the Fourth Proportional to 142,087.92, 196,087.86 and 81,678.12

Step by Step Solution

1. Step 1: Write the proportion equation
   142,087.92 : 196,087.86 = 81,678.12 : x
2. Step 2: Convert to fraction form
   142,087.92/196,087.86 = 81,678.12/x
3. Step 3: Cross multiply
   142,087.92x = 196,087.86 × 81,678.12
4. Step 4: Simplify right side
   142,087.92x = 16,016,087,759.62
5. Step 5: Solve for x
   x = 16,016,087,759.62/142,087.92
6. Step 6: Final answer
   x = 112,719.56