Finding the Fourth Proportional to 21,728.39, 29,983.01 and 12,167.73

Step by Step Solution

1. Step 1: Write the proportion equation
   21,728.39 : 29,983.01 = 12,167.73 : x
2. Step 2: Convert to fraction form
   21,728.39/29,983.01 = 12,167.73/x
3. Step 3: Cross multiply
   21,728.39x = 29,983.01 × 12,167.73
4. Step 4: Simplify right side
   21,728.39x = 364,825,109.43
5. Step 5: Solve for x
   x = 364,825,109.43/21,728.39
6. Step 6: Final answer
   x = 16,790.25