Finding the Third Proportional to 8,978 and 13,705

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978 : 13,705 = 13,705 : x
2. Step 2: Convert to fraction form
   8,978/13,705 = 13,705/x
3. Step 3: Cross multiply
   8,978x = 13,705 × 13,705
4. Step 4: Simplify right side
   8,978x = 187,827,025
5. Step 5: Solve for x
   x = 187,827,025/8,978
6. Step 6: Final answer
   x = 20,920.81