Finding the Third Proportional to 2,686 and 5,620

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686 : 5,620 = 5,620 : x
2. Step 2: Convert to fraction form
   2,686/5,620 = 5,620/x
3. Step 3: Cross multiply
   2,686x = 5,620 × 5,620
4. Step 4: Simplify right side
   2,686x = 31,584,400
5. Step 5: Solve for x
   x = 31,584,400/2,686
6. Step 6: Final answer
   x = 11,758.90