Finding the Fourth Proportional to 2,456.76, 3,390.12 and 1,408.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.76 : 3,390.12 = 1,408.80 : x
2. Step 2: Convert to fraction form
   2,456.76/3,390.12 = 1,408.80/x
3. Step 3: Cross multiply
   2,456.76x = 3,390.12 × 1,408.80
4. Step 4: Simplify right side
   2,456.76x = 4,776,001.06
5. Step 5: Solve for x
   x = 4,776,001.06/2,456.76
6. Step 6: Final answer
   x = 1,944.02