Finding the Fourth Proportional to 3,998.50, 5,521.31 and 2,508.91

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.50 : 5,521.31 = 2,508.91 : x
2. Step 2: Convert to fraction form
   3,998.50/5,521.31 = 2,508.91/x
3. Step 3: Cross multiply
   3,998.50x = 5,521.31 × 2,508.91
4. Step 4: Simplify right side
   3,998.50x = 13,852,469.87
5. Step 5: Solve for x
   x = 13,852,469.87/3,998.50
6. Step 6: Final answer
   x = 3,464.42