Finding the Fourth Proportional to 2,662.75, 3,993.97 and 813.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.75 : 3,993.97 = 813.86 : x
2. Step 2: Convert to fraction form
   2,662.75/3,993.97 = 813.86/x
3. Step 3: Cross multiply
   2,662.75x = 3,993.97 × 813.86
4. Step 4: Simplify right side
   2,662.75x = 3,250,531.45
5. Step 5: Solve for x
   x = 3,250,531.45/2,662.75
6. Step 6: Final answer
   x = 1,220.74