Finding the Fourth Proportional to 3,989.49, 5,506.29 and 2,311.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.49 : 5,506.29 = 2,311.27 : x
2. Step 2: Convert to fraction form
   3,989.49/5,506.29 = 2,311.27/x
3. Step 3: Cross multiply
   3,989.49x = 5,506.29 × 2,311.27
4. Step 4: Simplify right side
   3,989.49x = 12,726,522.89
5. Step 5: Solve for x
   x = 12,726,522.89/3,989.49
6. Step 6: Final answer
   x = 3,190.01