Finding the Fourth Proportional to 21,280.80, 31,923.39 and 8,144.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.80 : 31,923.39 = 8,144.22 : x
2. Step 2: Convert to fraction form
   21,280.80/31,923.39 = 8,144.22/x
3. Step 3: Cross multiply
   21,280.80x = 31,923.39 × 8,144.22
4. Step 4: Simplify right side
   21,280.80x = 259,991,111.31
5. Step 5: Solve for x
   x = 259,991,111.31/21,280.80
6. Step 6: Final answer
   x = 12,217.17