Finding the Third Proportional to 10,505 and 15,109

Step by Step Solution

1. Step 1: Write the proportion equation
   10,505 : 15,109 = 15,109 : x
2. Step 2: Convert to fraction form
   10,505/15,109 = 15,109/x
3. Step 3: Cross multiply
   10,505x = 15,109 × 15,109
4. Step 4: Simplify right side
   10,505x = 228,281,881
5. Step 5: Solve for x
   x = 228,281,881/10,505
6. Step 6: Final answer
   x = 21,730.78