Finding the Fourth Proportional to 16,591.15, 22,895.54 and 9,139.15

Step by Step Solution

1. Step 1: Write the proportion equation
   16,591.15 : 22,895.54 = 9,139.15 : x
2. Step 2: Convert to fraction form
   16,591.15/22,895.54 = 9,139.15/x
3. Step 3: Cross multiply
   16,591.15x = 22,895.54 × 9,139.15
4. Step 4: Simplify right side
   16,591.15x = 209,245,728.70
5. Step 5: Solve for x
   x = 209,245,728.70/16,591.15
6. Step 6: Final answer
   x = 12,611.89