Finding the Fourth Proportional to 11,443.69, 15,757.71 and 9,209.17

Step by Step Solution

1. Step 1: Write the proportion equation
   11,443.69 : 15,757.71 = 9,209.17 : x
2. Step 2: Convert to fraction form
   11,443.69/15,757.71 = 9,209.17/x
3. Step 3: Cross multiply
   11,443.69x = 15,757.71 × 9,209.17
4. Step 4: Simplify right side
   11,443.69x = 145,115,430.20
5. Step 5: Solve for x
   x = 145,115,430.20/11,443.69
6. Step 6: Final answer
   x = 12,680.82