Finding the Fourth Proportional to 2,639.61, 3,960.48 and 996.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.61 : 3,960.48 = 996.62 : x
2. Step 2: Convert to fraction form
   2,639.61/3,960.48 = 996.62/x
3. Step 3: Cross multiply
   2,639.61x = 3,960.48 × 996.62
4. Step 4: Simplify right side
   2,639.61x = 3,947,088.59
5. Step 5: Solve for x
   x = 3,947,088.59/2,639.61
6. Step 6: Final answer
   x = 1,495.33