Finding the Fourth Proportional to 2,587.83, 3,879.21 and 1,027.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.83 : 3,879.21 = 1,027.31 : x
2. Step 2: Convert to fraction form
   2,587.83/3,879.21 = 1,027.31/x
3. Step 3: Cross multiply
   2,587.83x = 3,879.21 × 1,027.31
4. Step 4: Simplify right side
   2,587.83x = 3,985,151.72
5. Step 5: Solve for x
   x = 3,985,151.72/2,587.83
6. Step 6: Final answer
   x = 1,539.96