Finding the Fourth Proportional to 2,078.83, 2,868.77 and 1,239.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.83 : 2,868.77 = 1,239.54 : x
2. Step 2: Convert to fraction form
   2,078.83/2,868.77 = 1,239.54/x
3. Step 3: Cross multiply
   2,078.83x = 2,868.77 × 1,239.54
4. Step 4: Simplify right side
   2,078.83x = 3,555,947.51
5. Step 5: Solve for x
   x = 3,555,947.51/2,078.83
6. Step 6: Final answer
   x = 1,710.55