Finding the Third Proportional to 8,615 and 12,669

Step by Step Solution

1. Step 1: Write the proportion equation
   8,615 : 12,669 = 12,669 : x
2. Step 2: Convert to fraction form
   8,615/12,669 = 12,669/x
3. Step 3: Cross multiply
   8,615x = 12,669 × 12,669
4. Step 4: Simplify right side
   8,615x = 160,503,561
5. Step 5: Solve for x
   x = 160,503,561/8,615
6. Step 6: Final answer
   x = 18,630.71