Finding the Fourth Proportional to 9,122.43, 12,587.89 and 5,143.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,122.43 : 12,587.89 = 5,143.31 : x
2. Step 2: Convert to fraction form
   9,122.43/12,587.89 = 5,143.31/x
3. Step 3: Cross multiply
   9,122.43x = 12,587.89 × 5,143.31
4. Step 4: Simplify right side
   9,122.43x = 64,743,401.57
5. Step 5: Solve for x
   x = 64,743,401.57/9,122.43
6. Step 6: Final answer
   x = 7,097.16