Finding the Third Proportional to 12,900 and 20,730

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900 : 20,730 = 20,730 : x
2. Step 2: Convert to fraction form
   12,900/20,730 = 20,730/x
3. Step 3: Cross multiply
   12,900x = 20,730 × 20,730
4. Step 4: Simplify right side
   12,900x = 429,732,900
5. Step 5: Solve for x
   x = 429,732,900/12,900
6. Step 6: Final answer
   x = 33,312.63