Finding the Fourth Proportional to 2,452.89, 3,679.79 and 809.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,452.89 : 3,679.79 = 809.55 : x
2. Step 2: Convert to fraction form
   2,452.89/3,679.79 = 809.55/x
3. Step 3: Cross multiply
   2,452.89x = 3,679.79 × 809.55
4. Step 4: Simplify right side
   2,452.89x = 2,978,973.99
5. Step 5: Solve for x
   x = 2,978,973.99/2,452.89
6. Step 6: Final answer
   x = 1,214.48