Finding the Fourth Proportional to 16,290.38, 22,478.83 and 9,120.70

Step by Step Solution

1. Step 1: Write the proportion equation
   16,290.38 : 22,478.83 = 9,120.70 : x
2. Step 2: Convert to fraction form
   16,290.38/22,478.83 = 9,120.70/x
3. Step 3: Cross multiply
   16,290.38x = 22,478.83 × 9,120.70
4. Step 4: Simplify right side
   16,290.38x = 205,022,664.78
5. Step 5: Solve for x
   x = 205,022,664.78/16,290.38
6. Step 6: Final answer
   x = 12,585.51