Finding the Fourth Proportional to 2,505.40, 3,757.18 and 861.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.40 : 3,757.18 = 861.48 : x
2. Step 2: Convert to fraction form
   2,505.40/3,757.18 = 861.48/x
3. Step 3: Cross multiply
   2,505.40x = 3,757.18 × 861.48
4. Step 4: Simplify right side
   2,505.40x = 3,236,735.43
5. Step 5: Solve for x
   x = 3,236,735.43/2,505.40
6. Step 6: Final answer
   x = 1,291.90