Finding the Fourth Proportional to 16,290.24, 22,476.88 and 9,920.18

Step by Step Solution

1. Step 1: Write the proportion equation
   16,290.24 : 22,476.88 = 9,920.18 : x
2. Step 2: Convert to fraction form
   16,290.24/22,476.88 = 9,920.18/x
3. Step 3: Cross multiply
   16,290.24x = 22,476.88 × 9,920.18
4. Step 4: Simplify right side
   16,290.24x = 222,974,695.44
5. Step 5: Solve for x
   x = 222,974,695.44/16,290.24
6. Step 6: Final answer
   x = 13,687.62