Finding the Fourth Proportional to 12,951.20, 17,856.72 and 9,589.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,951.20 : 17,856.72 = 9,589.28 : x
2. Step 2: Convert to fraction form
   12,951.20/17,856.72 = 9,589.28/x
3. Step 3: Cross multiply
   12,951.20x = 17,856.72 × 9,589.28
4. Step 4: Simplify right side
   12,951.20x = 171,233,087.96
5. Step 5: Solve for x
   x = 171,233,087.96/12,951.20
6. Step 6: Final answer
   x = 13,221.41