Finding the Fourth Proportional to 2,559.89, 3,839.49 and 916.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.89 : 3,839.49 = 916.23 : x
2. Step 2: Convert to fraction form
   2,559.89/3,839.49 = 916.23/x
3. Step 3: Cross multiply
   2,559.89x = 3,839.49 × 916.23
4. Step 4: Simplify right side
   2,559.89x = 3,517,855.92
5. Step 5: Solve for x
   x = 3,517,855.92/2,559.89
6. Step 6: Final answer
   x = 1,374.22