Finding the Fourth Proportional to 16,391.27, 22,619.39 and 9,221.31

Step by Step Solution

1. Step 1: Write the proportion equation
   16,391.27 : 22,619.39 = 9,221.31 : x
2. Step 2: Convert to fraction form
   16,391.27/22,619.39 = 9,221.31/x
3. Step 3: Cross multiply
   16,391.27x = 22,619.39 × 9,221.31
4. Step 4: Simplify right side
   16,391.27x = 208,580,361.09
5. Step 5: Solve for x
   x = 208,580,361.09/16,391.27
6. Step 6: Final answer
   x = 12,725.09