Finding the Fourth Proportional to 2,453.31, 3,679.09 and 809.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.31 : 3,679.09 = 809.48 : x
2. Step 2: Convert to fraction form
   2,453.31/3,679.09 = 809.48/x
3. Step 3: Cross multiply
   2,453.31x = 3,679.09 × 809.48
4. Step 4: Simplify right side
   2,453.31x = 2,978,156.95
5. Step 5: Solve for x
   x = 2,978,156.95/2,453.31
6. Step 6: Final answer
   x = 1,213.93