Finding the Fourth Proportional to 2,115.75, 2,920.74 and 1,408.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.75 : 2,920.74 = 1,408.77 : x
2. Step 2: Convert to fraction form
   2,115.75/2,920.74 = 1,408.77/x
3. Step 3: Cross multiply
   2,115.75x = 2,920.74 × 1,408.77
4. Step 4: Simplify right side
   2,115.75x = 4,114,650.89
5. Step 5: Solve for x
   x = 4,114,650.89/2,115.75
6. Step 6: Final answer
   x = 1,944.77