Finding the Fourth Proportional to 4,105.72, 5,665.90 and 2,217.31

Step by Step Solution

1. Step 1: Write the proportion equation
   4,105.72 : 5,665.90 = 2,217.31 : x
2. Step 2: Convert to fraction form
   4,105.72/5,665.90 = 2,217.31/x
3. Step 3: Cross multiply
   4,105.72x = 5,665.90 × 2,217.31
4. Step 4: Simplify right side
   4,105.72x = 12,563,024.32
5. Step 5: Solve for x
   x = 12,563,024.32/4,105.72
6. Step 6: Final answer
   x = 3,059.88