Finding the Fourth Proportional to 2,290.89, 3,436.62 and 809.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,290.89 : 3,436.62 = 809.77 : x
2. Step 2: Convert to fraction form
   2,290.89/3,436.62 = 809.77/x
3. Step 3: Cross multiply
   2,290.89x = 3,436.62 × 809.77
4. Step 4: Simplify right side
   2,290.89x = 2,782,871.78
5. Step 5: Solve for x
   x = 2,782,871.78/2,290.89
6. Step 6: Final answer
   x = 1,214.76