Finding the Third Proportional to 8,128 and 12,147

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128 : 12,147 = 12,147 : x
2. Step 2: Convert to fraction form
   8,128/12,147 = 12,147/x
3. Step 3: Cross multiply
   8,128x = 12,147 × 12,147
4. Step 4: Simplify right side
   8,128x = 147,549,609
5. Step 5: Solve for x
   x = 147,549,609/8,128
6. Step 6: Final answer
   x = 18,153.25