Finding the Fourth Proportional to 2,464.50, 3,696.78 and 640.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,464.50 : 3,696.78 = 640.50 : x
2. Step 2: Convert to fraction form
   2,464.50/3,696.78 = 640.50/x
3. Step 3: Cross multiply
   2,464.50x = 3,696.78 × 640.50
4. Step 4: Simplify right side
   2,464.50x = 2,367,787.59
5. Step 5: Solve for x
   x = 2,367,787.59/2,464.50
6. Step 6: Final answer
   x = 960.76