Finding the Third Proportional to 2,640.94 and 3,980.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,640.94 : 3,980.81 = 3,980.81 : x
2. Step 2: Convert to fraction form
   2,640.94/3,980.81 = 3,980.81/x
3. Step 3: Cross multiply
   2,640.94x = 3,980.81 × 3,980.81
4. Step 4: Simplify right side
   2,640.94x = 15,846,868.16
5. Step 5: Solve for x
   x = 15,846,868.16/2,640.94
6. Step 6: Final answer
   x = 6,000.47