Finding the Fourth Proportional to 16,772.61, 23,144.69 and 9,218.85

Step by Step Solution

1. Step 1: Write the proportion equation
   16,772.61 : 23,144.69 = 9,218.85 : x
2. Step 2: Convert to fraction form
   16,772.61/23,144.69 = 9,218.85/x
3. Step 3: Cross multiply
   16,772.61x = 23,144.69 × 9,218.85
4. Step 4: Simplify right side
   16,772.61x = 213,367,379.31
5. Step 5: Solve for x
   x = 213,367,379.31/16,772.61
6. Step 6: Final answer
   x = 12,721.18