Finding the Fourth Proportional to 2,456.67, 3,390.39 and 1,408.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.67 : 3,390.39 = 1,408.89 : x
2. Step 2: Convert to fraction form
   2,456.67/3,390.39 = 1,408.89/x
3. Step 3: Cross multiply
   2,456.67x = 3,390.39 × 1,408.89
4. Step 4: Simplify right side
   2,456.67x = 4,776,686.57
5. Step 5: Solve for x
   x = 4,776,686.57/2,456.67
6. Step 6: Final answer
   x = 1,944.37