Finding the Fourth Proportional to 2,610.54, 3,916.41 and 855.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.54 : 3,916.41 = 855.60 : x
2. Step 2: Convert to fraction form
   2,610.54/3,916.41 = 855.60/x
3. Step 3: Cross multiply
   2,610.54x = 3,916.41 × 855.60
4. Step 4: Simplify right side
   2,610.54x = 3,350,880.40
5. Step 5: Solve for x
   x = 3,350,880.40/2,610.54
6. Step 6: Final answer
   x = 1,283.60