Finding the Fourth Proportional to 2,456.72, 3,390.40 and 1,408.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.72 : 3,390.40 = 1,408.56 : x
2. Step 2: Convert to fraction form
   2,456.72/3,390.40 = 1,408.56/x
3. Step 3: Cross multiply
   2,456.72x = 3,390.40 × 1,408.56
4. Step 4: Simplify right side
   2,456.72x = 4,775,581.82
5. Step 5: Solve for x
   x = 4,775,581.82/2,456.72
6. Step 6: Final answer
   x = 1,943.89