Finding the Fourth Proportional to 2,456.76, 3,683.73 and 812.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.76 : 3,683.73 = 812.87 : x
2. Step 2: Convert to fraction form
   2,456.76/3,683.73 = 812.87/x
3. Step 3: Cross multiply
   2,456.76x = 3,683.73 × 812.87
4. Step 4: Simplify right side
   2,456.76x = 2,994,393.61
5. Step 5: Solve for x
   x = 2,994,393.61/2,456.76
6. Step 6: Final answer
   x = 1,218.84