Finding the Fourth Proportional to 12,644.88, 17,449.92 and 7,339.92

Step by Step Solution

1. Step 1: Write the proportion equation
   12,644.88 : 17,449.92 = 7,339.92 : x
2. Step 2: Convert to fraction form
   12,644.88/17,449.92 = 7,339.92/x
3. Step 3: Cross multiply
   12,644.88x = 17,449.92 × 7,339.92
4. Step 4: Simplify right side
   12,644.88x = 128,081,016.81
5. Step 5: Solve for x
   x = 128,081,016.81/12,644.88
6. Step 6: Final answer
   x = 10,129.08