Finding the Fourth Proportional to 2,639.99, 3,960.89 and 997.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.99 : 3,960.89 = 997.01 : x
2. Step 2: Convert to fraction form
   2,639.99/3,960.89 = 997.01/x
3. Step 3: Cross multiply
   2,639.99x = 3,960.89 × 997.01
4. Step 4: Simplify right side
   2,639.99x = 3,949,046.94
5. Step 5: Solve for x
   x = 3,949,046.94/2,639.99
6. Step 6: Final answer
   x = 1,495.86