Finding the Fourth Proportional to 2,456.56, 3,685.45 and 813.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.56 : 3,685.45 = 813.27 : x
2. Step 2: Convert to fraction form
   2,456.56/3,685.45 = 813.27/x
3. Step 3: Cross multiply
   2,456.56x = 3,685.45 × 813.27
4. Step 4: Simplify right side
   2,456.56x = 2,997,266.58
5. Step 5: Solve for x
   x = 2,997,266.58/2,456.56
6. Step 6: Final answer
   x = 1,220.11