Finding the Fourth Proportional to 12,744, 17,586.72 and 7,155.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,744 : 17,586.72 = 7,155.12 : x
2. Step 2: Convert to fraction form
   12,744/17,586.72 = 7,155.12/x
3. Step 3: Cross multiply
   12,744x = 17,586.72 × 7,155.12
4. Step 4: Simplify right side
   12,744x = 125,835,092.01
5. Step 5: Solve for x
   x = 125,835,092.01/12,744
6. Step 6: Final answer
   x = 9,874.07