Finding the Fourth Proportional to 9,123.43, 12,589.27 and 5,144.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,123.43 : 12,589.27 = 5,144.31 : x
2. Step 2: Convert to fraction form
   9,123.43/12,589.27 = 5,144.31/x
3. Step 3: Cross multiply
   9,123.43x = 12,589.27 × 5,144.31
4. Step 4: Simplify right side
   9,123.43x = 64,763,107.55
5. Step 5: Solve for x
   x = 64,763,107.55/9,123.43
6. Step 6: Final answer
   x = 7,098.55