Finding the Fourth Proportional to 9,143.69, 13,704.29 and 7,287.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,143.69 : 13,704.29 = 7,287.17 : x
2. Step 2: Convert to fraction form
   9,143.69/13,704.29 = 7,287.17/x
3. Step 3: Cross multiply
   9,143.69x = 13,704.29 × 7,287.17
4. Step 4: Simplify right side
   9,143.69x = 99,865,386.00
5. Step 5: Solve for x
   x = 99,865,386.00/9,143.69
6. Step 6: Final answer
   x = 10,921.79