Finding the Fourth Proportional to 2,078.35, 2,868.15 and 1,239.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.35 : 2,868.15 = 1,239.54 : x
2. Step 2: Convert to fraction form
   2,078.35/2,868.15 = 1,239.54/x
3. Step 3: Cross multiply
   2,078.35x = 2,868.15 × 1,239.54
4. Step 4: Simplify right side
   2,078.35x = 3,555,181.27
5. Step 5: Solve for x
   x = 3,555,181.27/2,078.35
6. Step 6: Final answer
   x = 1,710.58