Finding the Fourth Proportional to 111,162.78, 166,834.08 and 86,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,162.78 : 166,834.08 = 86,143.50 : x
2. Step 2: Convert to fraction form
   111,162.78/166,834.08 = 86,143.50/x
3. Step 3: Cross multiply
   111,162.78x = 166,834.08 × 86,143.50
4. Step 4: Simplify right side
   111,162.78x = 14,371,671,570.48
5. Step 5: Solve for x
   x = 14,371,671,570.48/111,162.78
6. Step 6: Final answer
   x = 129,284.92