Finding the Fourth Proportional to 2,559.66, 3,840.18 and 916.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,559.66 : 3,840.18 = 916.38 : x
2. Step 2: Convert to fraction form
   2,559.66/3,840.18 = 916.38/x
3. Step 3: Cross multiply
   2,559.66x = 3,840.18 × 916.38
4. Step 4: Simplify right side
   2,559.66x = 3,519,064.15
5. Step 5: Solve for x
   x = 3,519,064.15/2,559.66
6. Step 6: Final answer
   x = 1,374.82