Finding the Fourth Proportional to 2,559.33, 3,839.28 and 916.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.33 : 3,839.28 = 916.05 : x
2. Step 2: Convert to fraction form
   2,559.33/3,839.28 = 916.05/x
3. Step 3: Cross multiply
   2,559.33x = 3,839.28 × 916.05
4. Step 4: Simplify right side
   2,559.33x = 3,516,972.44
5. Step 5: Solve for x
   x = 3,516,972.44/2,559.33
6. Step 6: Final answer
   x = 1,374.18