Finding the Fourth Proportional to 21,722.33, 29,977.98 and 13,223.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,722.33 : 29,977.98 = 13,223.10 : x
2. Step 2: Convert to fraction form
   21,722.33/29,977.98 = 13,223.10/x
3. Step 3: Cross multiply
   21,722.33x = 29,977.98 × 13,223.10
4. Step 4: Simplify right side
   21,722.33x = 396,401,827.34
5. Step 5: Solve for x
   x = 396,401,827.34/21,722.33
6. Step 6: Final answer
   x = 18,248.59