Finding the Fourth Proportional to 12,082.30, 18,139.65 and 7,708.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,082.30 : 18,139.65 = 7,708.30 : x
2. Step 2: Convert to fraction form
   12,082.30/18,139.65 = 7,708.30/x
3. Step 3: Cross multiply
   12,082.30x = 18,139.65 × 7,708.30
4. Step 4: Simplify right side
   12,082.30x = 139,825,864.10
5. Step 5: Solve for x
   x = 139,825,864.10/12,082.30
6. Step 6: Final answer
   x = 11,572.79