Finding the Fourth Proportional to 12,724.38, 17,567.89 and 8,189.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,724.38 : 17,567.89 = 8,189.09 : x
2. Step 2: Convert to fraction form
   12,724.38/17,567.89 = 8,189.09/x
3. Step 3: Cross multiply
   12,724.38x = 17,567.89 × 8,189.09
4. Step 4: Simplify right side
   12,724.38x = 143,864,989.89
5. Step 5: Solve for x
   x = 143,864,989.89/12,724.38
6. Step 6: Final answer
   x = 11,306.25