Finding the Fourth Proportional to 8,008.50, 12,025.06 and 7,139.18

Step by Step Solution

1. Step 1: Write the proportion equation
   8,008.50 : 12,025.06 = 7,139.18 : x
2. Step 2: Convert to fraction form
   8,008.50/12,025.06 = 7,139.18/x
3. Step 3: Cross multiply
   8,008.50x = 12,025.06 × 7,139.18
4. Step 4: Simplify right side
   8,008.50x = 85,849,067.85
5. Step 5: Solve for x
   x = 85,849,067.85/8,008.50
6. Step 6: Final answer
   x = 10,719.74