Finding the Fourth Proportional to 21,205.72, 31,805.34 and 5,623.21

Step by Step Solution

1. Step 1: Write the proportion equation
   21,205.72 : 31,805.34 = 5,623.21 : x
2. Step 2: Convert to fraction form
   21,205.72/31,805.34 = 5,623.21/x
3. Step 3: Cross multiply
   21,205.72x = 31,805.34 × 5,623.21
4. Step 4: Simplify right side
   21,205.72x = 178,848,105.94
5. Step 5: Solve for x
   x = 178,848,105.94/21,205.72
6. Step 6: Final answer
   x = 8,433.96