Finding the Fourth Proportional to 16,204.45, 22,355.56 and 9,920.47

Step by Step Solution

1. Step 1: Write the proportion equation
   16,204.45 : 22,355.56 = 9,920.47 : x
2. Step 2: Convert to fraction form
   16,204.45/22,355.56 = 9,920.47/x
3. Step 3: Cross multiply
   16,204.45x = 22,355.56 × 9,920.47
4. Step 4: Simplify right side
   16,204.45x = 221,777,662.31
5. Step 5: Solve for x
   x = 221,777,662.31/16,204.45
6. Step 6: Final answer
   x = 13,686.22