Finding the Third Proportional to 12,730 and 20,147

Step by Step Solution

1. Step 1: Write the proportion equation
   12,730 : 20,147 = 20,147 : x
2. Step 2: Convert to fraction form
   12,730/20,147 = 20,147/x
3. Step 3: Cross multiply
   12,730x = 20,147 × 20,147
4. Step 4: Simplify right side
   12,730x = 405,901,609
5. Step 5: Solve for x
   x = 405,901,609/12,730
6. Step 6: Final answer
   x = 31,885.44