Finding the Fourth Proportional to 2,640.05, 3,961.13 and 997.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.05 : 3,961.13 = 997.07 : x
2. Step 2: Convert to fraction form
   2,640.05/3,961.13 = 997.07/x
3. Step 3: Cross multiply
   2,640.05x = 3,961.13 × 997.07
4. Step 4: Simplify right side
   2,640.05x = 3,949,499.10
5. Step 5: Solve for x
   x = 3,949,499.10/2,640.05
6. Step 6: Final answer
   x = 1,496.00