Finding the Fourth Proportional to 3,899.57, 5,381.57 and 2,406.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.57 : 5,381.57 = 2,406.41 : x
2. Step 2: Convert to fraction form
   3,899.57/5,381.57 = 2,406.41/x
3. Step 3: Cross multiply
   3,899.57x = 5,381.57 × 2,406.41
4. Step 4: Simplify right side
   3,899.57x = 12,950,263.86
5. Step 5: Solve for x
   x = 12,950,263.86/3,899.57
6. Step 6: Final answer
   x = 3,320.95