Finding the Third Proportional to 2,776 and 3,980

Step by Step Solution

1. Step 1: Write the proportion equation
   2,776 : 3,980 = 3,980 : x
2. Step 2: Convert to fraction form
   2,776/3,980 = 3,980/x
3. Step 3: Cross multiply
   2,776x = 3,980 × 3,980
4. Step 4: Simplify right side
   2,776x = 15,840,400
5. Step 5: Solve for x
   x = 15,840,400/2,776
6. Step 6: Final answer
   x = 5,706.20