Finding the Fourth Proportional to 16,431.05, 22,675.55 and 9,720.61

Step by Step Solution

1. Step 1: Write the proportion equation
   16,431.05 : 22,675.55 = 9,720.61 : x
2. Step 2: Convert to fraction form
   16,431.05/22,675.55 = 9,720.61/x
3. Step 3: Cross multiply
   16,431.05x = 22,675.55 × 9,720.61
4. Step 4: Simplify right side
   16,431.05x = 220,420,072.79
5. Step 5: Solve for x
   x = 220,420,072.79/16,431.05
6. Step 6: Final answer
   x = 13,414.85