Finding the Fourth Proportional to 2,605.72, 3,904.89 and 960.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.72 : 3,904.89 = 960.61 : x
2. Step 2: Convert to fraction form
   2,605.72/3,904.89 = 960.61/x
3. Step 3: Cross multiply
   2,605.72x = 3,904.89 × 960.61
4. Step 4: Simplify right side
   2,605.72x = 3,751,076.38
5. Step 5: Solve for x
   x = 3,751,076.38/2,605.72
6. Step 6: Final answer
   x = 1,439.55