Finding the Third Proportional to 3,920 and 10,580

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920 : 10,580 = 10,580 : x
2. Step 2: Convert to fraction form
   3,920/10,580 = 10,580/x
3. Step 3: Cross multiply
   3,920x = 10,580 × 10,580
4. Step 4: Simplify right side
   3,920x = 111,936,400
5. Step 5: Solve for x
   x = 111,936,400/3,920
6. Step 6: Final answer
   x = 28,555.20