Finding the Third Proportional to 12,111 and 18,705

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111 : 18,705 = 18,705 : x
2. Step 2: Convert to fraction form
   12,111/18,705 = 18,705/x
3. Step 3: Cross multiply
   12,111x = 18,705 × 18,705
4. Step 4: Simplify right side
   12,111x = 349,877,025
5. Step 5: Solve for x
   x = 349,877,025/12,111
6. Step 6: Final answer
   x = 28,889.19