Finding the Fourth Proportional to 2,605.43, 3,908.18 and 874.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.43 : 3,908.18 = 874.05 : x
2. Step 2: Convert to fraction form
   2,605.43/3,908.18 = 874.05/x
3. Step 3: Cross multiply
   2,605.43x = 3,908.18 × 874.05
4. Step 4: Simplify right side
   2,605.43x = 3,415,944.73
5. Step 5: Solve for x
   x = 3,415,944.73/2,605.43
6. Step 6: Final answer
   x = 1,311.09