Finding the Fourth Proportional to 3,863.57, 5,795.80 and 1,399.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,863.57 : 5,795.80 = 1,399.55 : x
2. Step 2: Convert to fraction form
   3,863.57/5,795.80 = 1,399.55/x
3. Step 3: Cross multiply
   3,863.57x = 5,795.80 × 1,399.55
4. Step 4: Simplify right side
   3,863.57x = 8,111,511.89
5. Step 5: Solve for x
   x = 8,111,511.89/3,863.57
6. Step 6: Final answer
   x = 2,099.49