Finding the Fourth Proportional to 2,640.88, 3,959.16 and 996.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.88 : 3,959.16 = 996.49 : x
2. Step 2: Convert to fraction form
   2,640.88/3,959.16 = 996.49/x
3. Step 3: Cross multiply
   2,640.88x = 3,959.16 × 996.49
4. Step 4: Simplify right side
   2,640.88x = 3,945,263.35
5. Step 5: Solve for x
   x = 3,945,263.35/2,640.88
6. Step 6: Final answer
   x = 1,493.92