Finding the Fourth Proportional to 142,787.86, 197,052.33 and 86,188.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142,787.86 : 197,052.33 = 86,188.18 : x
2. Step 2: Convert to fraction form
   142,787.86/197,052.33 = 86,188.18/x
3. Step 3: Cross multiply
   142,787.86x = 197,052.33 × 86,188.18
4. Step 4: Simplify right side
   142,787.86x = 16,983,581,687.46
5. Step 5: Solve for x
   x = 16,983,581,687.46/142,787.86
6. Step 6: Final answer
   x = 118,942.76