Finding the Fourth Proportional to 16,728.87, 23,085.64 and 9,072.02

Step by Step Solution

1. Step 1: Write the proportion equation
   16,728.87 : 23,085.64 = 9,072.02 : x
2. Step 2: Convert to fraction form
   16,728.87/23,085.64 = 9,072.02/x
3. Step 3: Cross multiply
   16,728.87x = 23,085.64 × 9,072.02
4. Step 4: Simplify right side
   16,728.87x = 209,433,456.85
5. Step 5: Solve for x
   x = 209,433,456.85/16,728.87
6. Step 6: Final answer
   x = 12,519.28