Finding the Fourth Proportional to 2,587.52, 3,880.56 and 855.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,587.52 : 3,880.56 = 855.92 : x
2. Step 2: Convert to fraction form
   2,587.52/3,880.56 = 855.92/x
3. Step 3: Cross multiply
   2,587.52x = 3,880.56 × 855.92
4. Step 4: Simplify right side
   2,587.52x = 3,321,448.92
5. Step 5: Solve for x
   x = 3,321,448.92/2,587.52
6. Step 6: Final answer
   x = 1,283.64