Finding the Fourth Proportional to 2,585.35, 3,879.30 and 1,025.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,585.35 : 3,879.30 = 1,025.31 : x
2. Step 2: Convert to fraction form
   2,585.35/3,879.30 = 1,025.31/x
3. Step 3: Cross multiply
   2,585.35x = 3,879.30 × 1,025.31
4. Step 4: Simplify right side
   2,585.35x = 3,977,497.71
5. Step 5: Solve for x
   x = 3,977,497.71/2,585.35
6. Step 6: Final answer
   x = 1,538.48