Finding the Fourth Proportional to 2,425.78, 3,638.91 and 964.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,425.78 : 3,638.91 = 964.61 : x
2. Step 2: Convert to fraction form
   2,425.78/3,638.91 = 964.61/x
3. Step 3: Cross multiply
   2,425.78x = 3,638.91 × 964.61
4. Step 4: Simplify right side
   2,425.78x = 3,510,128.98
5. Step 5: Solve for x
   x = 3,510,128.98/2,425.78
6. Step 6: Final answer
   x = 1,447.01