Finding the Fourth Proportional to 16,639.56, 22,952.52 and 9,920.70

Step by Step Solution

1. Step 1: Write the proportion equation
   16,639.56 : 22,952.52 = 9,920.70 : x
2. Step 2: Convert to fraction form
   16,639.56/22,952.52 = 9,920.70/x
3. Step 3: Cross multiply
   16,639.56x = 22,952.52 × 9,920.70
4. Step 4: Simplify right side
   16,639.56x = 227,705,065.16
5. Step 5: Solve for x
   x = 227,705,065.16/16,639.56
6. Step 6: Final answer
   x = 13,684.56