Finding the Fourth Proportional to 21,724.62, 29,971.98 and 13,223.22

Step by Step Solution

1. Step 1: Write the proportion equation
   21,724.62 : 29,971.98 = 13,223.22 : x
2. Step 2: Convert to fraction form
   21,724.62/29,971.98 = 13,223.22/x
3. Step 3: Cross multiply
   21,724.62x = 29,971.98 × 13,223.22
4. Step 4: Simplify right side
   21,724.62x = 396,326,085.38
5. Step 5: Solve for x
   x = 396,326,085.38/21,724.62
6. Step 6: Final answer
   x = 18,243.18