Finding the Fourth Proportional to 2,505.12, 3,758.09 and 861.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,505.12 : 3,758.09 = 861.27 : x
2. Step 2: Convert to fraction form
   2,505.12/3,758.09 = 861.27/x
3. Step 3: Cross multiply
   2,505.12x = 3,758.09 × 861.27
4. Step 4: Simplify right side
   2,505.12x = 3,236,730.17
5. Step 5: Solve for x
   x = 3,236,730.17/2,505.12
6. Step 6: Final answer
   x = 1,292.05