Finding the Fourth Proportional to 12,066.20, 18,119.42 and 8,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,066.20 : 18,119.42 = 8,142.76 : x
2. Step 2: Convert to fraction form
   12,066.20/18,119.42 = 8,142.76/x
3. Step 3: Cross multiply
   12,066.20x = 18,119.42 × 8,142.76
4. Step 4: Simplify right side
   12,066.20x = 147,542,088.40
5. Step 5: Solve for x
   x = 147,542,088.40/12,066.20
6. Step 6: Final answer
   x = 12,227.72