Finding the Fourth Proportional to 4,078.78, 5,627.94 and 2,485.10

Step by Step Solution

1. Step 1: Write the proportion equation
   4,078.78 : 5,627.94 = 2,485.10 : x
2. Step 2: Convert to fraction form
   4,078.78/5,627.94 = 2,485.10/x
3. Step 3: Cross multiply
   4,078.78x = 5,627.94 × 2,485.10
4. Step 4: Simplify right side
   4,078.78x = 13,985,993.69
5. Step 5: Solve for x
   x = 13,985,993.69/4,078.78
6. Step 6: Final answer
   x = 3,428.96