Finding the Third Proportional to 8,040 and 13,020

Step by Step Solution

1. Step 1: Write the proportion equation
   8,040 : 13,020 = 13,020 : x
2. Step 2: Convert to fraction form
   8,040/13,020 = 13,020/x
3. Step 3: Cross multiply
   8,040x = 13,020 × 13,020
4. Step 4: Simplify right side
   8,040x = 169,520,400
5. Step 5: Solve for x
   x = 169,520,400/8,040
6. Step 6: Final answer
   x = 21,084.63