Finding the Fourth Proportional to 2,940.85, 4,410.78 and 861.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.85 : 4,410.78 = 861.04 : x
2. Step 2: Convert to fraction form
   2,940.85/4,410.78 = 861.04/x
3. Step 3: Cross multiply
   2,940.85x = 4,410.78 × 861.04
4. Step 4: Simplify right side
   2,940.85x = 3,797,858.01
5. Step 5: Solve for x
   x = 3,797,858.01/2,940.85
6. Step 6: Final answer
   x = 1,291.42