Finding the Fourth Proportional to 2,559.39, 3,839.13 and 916.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.39 : 3,839.13 = 916.35 : x
2. Step 2: Convert to fraction form
   2,559.39/3,839.13 = 916.35/x
3. Step 3: Cross multiply
   2,559.39x = 3,839.13 × 916.35
4. Step 4: Simplify right side
   2,559.39x = 3,517,986.78
5. Step 5: Solve for x
   x = 3,517,986.78/2,559.39
6. Step 6: Final answer
   x = 1,374.54