Finding the Fourth Proportional to 16,728.43, 23,085.17 and 9,174.56

Step by Step Solution

1. Step 1: Write the proportion equation
   16,728.43 : 23,085.17 = 9,174.56 : x
2. Step 2: Convert to fraction form
   16,728.43/23,085.17 = 9,174.56/x
3. Step 3: Cross multiply
   16,728.43x = 23,085.17 × 9,174.56
4. Step 4: Simplify right side
   16,728.43x = 211,796,323.52
5. Step 5: Solve for x
   x = 211,796,323.52/16,728.43
6. Step 6: Final answer
   x = 12,660.86