Finding the Fourth Proportional to 2,456.45, 3,683.72 and 812.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.45 : 3,683.72 = 812.55 : x
2. Step 2: Convert to fraction form
   2,456.45/3,683.72 = 812.55/x
3. Step 3: Cross multiply
   2,456.45x = 3,683.72 × 812.55
4. Step 4: Simplify right side
   2,456.45x = 2,993,202.62
5. Step 5: Solve for x
   x = 2,993,202.62/2,456.45
6. Step 6: Final answer
   x = 1,218.51