Finding the Fourth Proportional to 12,816.02, 17,686.13 and 7,150.61

Step by Step Solution

1. Step 1: Write the proportion equation
   12,816.02 : 17,686.13 = 7,150.61 : x
2. Step 2: Convert to fraction form
   12,816.02/17,686.13 = 7,150.61/x
3. Step 3: Cross multiply
   12,816.02x = 17,686.13 × 7,150.61
4. Step 4: Simplify right side
   12,816.02x = 126,466,626.50
5. Step 5: Solve for x
   x = 126,466,626.50/12,816.02
6. Step 6: Final answer
   x = 9,867.85