Finding the Fourth Proportional to 142,785.86, 197,049.57 and 86,186.18

Step by Step Solution

1. Step 1: Write the proportion equation
   142,785.86 : 197,049.57 = 86,186.18 : x
2. Step 2: Convert to fraction form
   142,785.86/197,049.57 = 86,186.18/x
3. Step 3: Cross multiply
   142,785.86x = 197,049.57 × 86,186.18
4. Step 4: Simplify right side
   142,785.86x = 16,982,949,708.94
5. Step 5: Solve for x
   x = 16,982,949,708.94/142,785.86
6. Step 6: Final answer
   x = 118,940.00