Finding the Fourth Proportional to 16,355.82, 22,578.63 and 9,639.18

Step by Step Solution

1. Step 1: Write the proportion equation
   16,355.82 : 22,578.63 = 9,639.18 : x
2. Step 2: Convert to fraction form
   16,355.82/22,578.63 = 9,639.18/x
3. Step 3: Cross multiply
   16,355.82x = 22,578.63 × 9,639.18
4. Step 4: Simplify right side
   16,355.82x = 217,639,478.72
5. Step 5: Solve for x
   x = 217,639,478.72/16,355.82
6. Step 6: Final answer
   x = 13,306.55