Finding the Third Proportional to 2,640 and 5,610

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640 : 5,610 = 5,610 : x
2. Step 2: Convert to fraction form
   2,640/5,610 = 5,610/x
3. Step 3: Cross multiply
   2,640x = 5,610 × 5,610
4. Step 4: Simplify right side
   2,640x = 31,472,100
5. Step 5: Solve for x
   x = 31,472,100/2,640
6. Step 6: Final answer
   x = 11,921.25