Finding the Fourth Proportional to 2,608.72, 3,909.39 and 963.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,608.72 : 3,909.39 = 963.61 : x
2. Step 2: Convert to fraction form
   2,608.72/3,909.39 = 963.61/x
3. Step 3: Cross multiply
   2,608.72x = 3,909.39 × 963.61
4. Step 4: Simplify right side
   2,608.72x = 3,767,127.30
5. Step 5: Solve for x
   x = 3,767,127.30/2,608.72
6. Step 6: Final answer
   x = 1,444.05