Finding the Third Proportional to 8,720 and 13,250

Step by Step Solution

1. Step 1: Write the proportion equation
   8,720 : 13,250 = 13,250 : x
2. Step 2: Convert to fraction form
   8,720/13,250 = 13,250/x
3. Step 3: Cross multiply
   8,720x = 13,250 × 13,250
4. Step 4: Simplify right side
   8,720x = 175,562,500
5. Step 5: Solve for x
   x = 175,562,500/8,720
6. Step 6: Final answer
   x = 20,133.31