Finding the Fourth Proportional to 12,086.80, 18,105.90 and 8,150.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,086.80 : 18,105.90 = 8,150.20 : x
2. Step 2: Convert to fraction form
   12,086.80/18,105.90 = 8,150.20/x
3. Step 3: Cross multiply
   12,086.80x = 18,105.90 × 8,150.20
4. Step 4: Simplify right side
   12,086.80x = 147,566,706.18
5. Step 5: Solve for x
   x = 147,566,706.18/12,086.80
6. Step 6: Final answer
   x = 12,208.91