Finding the Fourth Proportional to 12,781.24, 17,623.56 and 9,003.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.24 : 17,623.56 = 9,003.20 : x
2. Step 2: Convert to fraction form
   12,781.24/17,623.56 = 9,003.20/x
3. Step 3: Cross multiply
   12,781.24x = 17,623.56 × 9,003.20
4. Step 4: Simplify right side
   12,781.24x = 158,668,435.39
5. Step 5: Solve for x
   x = 158,668,435.39/12,781.24
6. Step 6: Final answer
   x = 12,414.17