Finding the Fourth Proportional to 2,456.56, 3,390.07 and 1,408.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.56 : 3,390.07 = 1,408.42 : x
2. Step 2: Convert to fraction form
   2,456.56/3,390.07 = 1,408.42/x
3. Step 3: Cross multiply
   2,456.56x = 3,390.07 × 1,408.42
4. Step 4: Simplify right side
   2,456.56x = 4,774,642.81
5. Step 5: Solve for x
   x = 4,774,642.81/2,456.56
6. Step 6: Final answer
   x = 1,943.63