Finding the Fourth Proportional to 2,456.50, 3,390.18 and 1,408.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.50 : 3,390.18 = 1,408.78 : x
2. Step 2: Convert to fraction form
   2,456.50/3,390.18 = 1,408.78/x
3. Step 3: Cross multiply
   2,456.50x = 3,390.18 × 1,408.78
4. Step 4: Simplify right side
   2,456.50x = 4,776,017.78
5. Step 5: Solve for x
   x = 4,776,017.78/2,456.50
6. Step 6: Final answer
   x = 1,944.24