Finding the Fourth Proportional to 12,456.24, 17,188.80 and 7,675.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,456.24 : 17,188.80 = 7,675.20 : x
2. Step 2: Convert to fraction form
   12,456.24/17,188.80 = 7,675.20/x
3. Step 3: Cross multiply
   12,456.24x = 17,188.80 × 7,675.20
4. Step 4: Simplify right side
   12,456.24x = 131,927,477.76
5. Step 5: Solve for x
   x = 131,927,477.76/12,456.24
6. Step 6: Final answer
   x = 10,591.28