Finding the Fourth Proportional to 2,504.87, 3,757.55 and 861.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,504.87 : 3,757.55 = 861.20 : x
2. Step 2: Convert to fraction form
   2,504.87/3,757.55 = 861.20/x
3. Step 3: Cross multiply
   2,504.87x = 3,757.55 × 861.20
4. Step 4: Simplify right side
   2,504.87x = 3,236,002.06
5. Step 5: Solve for x
   x = 3,236,002.06/2,504.87
6. Step 6: Final answer
   x = 1,291.88