Finding the Fourth Proportional to 22,859.27, 31,557.30 and 21,638.33

Step by Step Solution

1. Step 1: Write the proportion equation
   22,859.27 : 31,557.30 = 21,638.33 : x
2. Step 2: Convert to fraction form
   22,859.27/31,557.30 = 21,638.33/x
3. Step 3: Cross multiply
   22,859.27x = 31,557.30 × 21,638.33
4. Step 4: Simplify right side
   22,859.27x = 682,847,271.31
5. Step 5: Solve for x
   x = 682,847,271.31/22,859.27
6. Step 6: Final answer
   x = 29,871.79