Finding the Third Proportional to 12,620 and 18,109

Step by Step Solution

1. Step 1: Write the proportion equation
   12,620 : 18,109 = 18,109 : x
2. Step 2: Convert to fraction form
   12,620/18,109 = 18,109/x
3. Step 3: Cross multiply
   12,620x = 18,109 × 18,109
4. Step 4: Simplify right side
   12,620x = 327,935,881
5. Step 5: Solve for x
   x = 327,935,881/12,620
6. Step 6: Final answer
   x = 25,985.41