Finding the Fourth Proportional to 2,456.60, 3,390.20 and 1,408.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.60 : 3,390.20 = 1,408.86 : x
2. Step 2: Convert to fraction form
   2,456.60/3,390.20 = 1,408.86/x
3. Step 3: Cross multiply
   2,456.60x = 3,390.20 × 1,408.86
4. Step 4: Simplify right side
   2,456.60x = 4,776,320.69
5. Step 5: Solve for x
   x = 4,776,320.69/2,456.60
6. Step 6: Final answer
   x = 1,944.28