Finding the Fourth Proportional to 1,874.90, 2,587.86 and 1,078.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,874.90 : 2,587.86 = 1,078.31 : x
2. Step 2: Convert to fraction form
   1,874.90/2,587.86 = 1,078.31/x
3. Step 3: Cross multiply
   1,874.90x = 2,587.86 × 1,078.31
4. Step 4: Simplify right side
   1,874.90x = 2,790,524.48
5. Step 5: Solve for x
   x = 2,790,524.48/1,874.90
6. Step 6: Final answer
   x = 1,488.36