Finding the Third Proportional to 8,666 and 13,109

Step by Step Solution

1. Step 1: Write the proportion equation
   8,666 : 13,109 = 13,109 : x
2. Step 2: Convert to fraction form
   8,666/13,109 = 13,109/x
3. Step 3: Cross multiply
   8,666x = 13,109 × 13,109
4. Step 4: Simplify right side
   8,666x = 171,845,881
5. Step 5: Solve for x
   x = 171,845,881/8,666
6. Step 6: Final answer
   x = 19,829.90