Finding the Fourth Proportional to 3,899.54, 5,381.54 and 2,406.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.54 : 5,381.54 = 2,406.31 : x
2. Step 2: Convert to fraction form
   3,899.54/5,381.54 = 2,406.31/x
3. Step 3: Cross multiply
   3,899.54x = 5,381.54 × 2,406.31
4. Step 4: Simplify right side
   3,899.54x = 12,949,637.06
5. Step 5: Solve for x
   x = 12,949,637.06/3,899.54
6. Step 6: Final answer
   x = 3,320.81