Finding the Fourth Proportional to 2,055.36, 3,078.72 and 960.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,055.36 : 3,078.72 = 960.60 : x
2. Step 2: Convert to fraction form
   2,055.36/3,078.72 = 960.60/x
3. Step 3: Cross multiply
   2,055.36x = 3,078.72 × 960.60
4. Step 4: Simplify right side
   2,055.36x = 2,957,418.43
5. Step 5: Solve for x
   x = 2,957,418.43/2,055.36
6. Step 6: Final answer
   x = 1,438.88