Finding the Third Proportional to 12,111 and 18,519

Step by Step Solution

1. Step 1: Write the proportion equation
   12,111 : 18,519 = 18,519 : x
2. Step 2: Convert to fraction form
   12,111/18,519 = 18,519/x
3. Step 3: Cross multiply
   12,111x = 18,519 × 18,519
4. Step 4: Simplify right side
   12,111x = 342,953,361
5. Step 5: Solve for x
   x = 342,953,361/12,111
6. Step 6: Final answer
   x = 28,317.51