Finding the Fourth Proportional to 12,444.78, 17,173.17 and 7,728.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,444.78 : 17,173.17 = 7,728.96 : x
2. Step 2: Convert to fraction form
   12,444.78/17,173.17 = 7,728.96/x
3. Step 3: Cross multiply
   12,444.78x = 17,173.17 × 7,728.96
4. Step 4: Simplify right side
   12,444.78x = 132,730,744.00
5. Step 5: Solve for x
   x = 132,730,744.00/12,444.78
6. Step 6: Final answer
   x = 10,665.58