Finding the Third Proportional to 1,640.25 and 3,540

Step by Step Solution

1. Step 1: Write the proportion equation
   1,640.25 : 3,540 = 3,540 : x
2. Step 2: Convert to fraction form
   1,640.25/3,540 = 3,540/x
3. Step 3: Cross multiply
   1,640.25x = 3,540 × 3,540
4. Step 4: Simplify right side
   1,640.25x = 12,531,600
5. Step 5: Solve for x
   x = 12,531,600/1,640.25
6. Step 6: Final answer
   x = 7,640.05