Finding the Fourth Proportional to 16,591.76, 22,896.72 and 9,139.76

Step by Step Solution

1. Step 1: Write the proportion equation
   16,591.76 : 22,896.72 = 9,139.76 : x
2. Step 2: Convert to fraction form
   16,591.76/22,896.72 = 9,139.76/x
3. Step 3: Cross multiply
   16,591.76x = 22,896.72 × 9,139.76
4. Step 4: Simplify right side
   16,591.76x = 209,270,525.59
5. Step 5: Solve for x
   x = 209,270,525.59/16,591.76
6. Step 6: Final answer
   x = 12,612.92