Finding the Third Proportional to 8,240 and 13,240

Step by Step Solution

1. Step 1: Write the proportion equation
   8,240 : 13,240 = 13,240 : x
2. Step 2: Convert to fraction form
   8,240/13,240 = 13,240/x
3. Step 3: Cross multiply
   8,240x = 13,240 × 13,240
4. Step 4: Simplify right side
   8,240x = 175,297,600
5. Step 5: Solve for x
   x = 175,297,600/8,240
6. Step 6: Final answer
   x = 21,273.98