Finding the Third Proportional to 7,900 and 12,726

Step by Step Solution

1. Step 1: Write the proportion equation
   7,900 : 12,726 = 12,726 : x
2. Step 2: Convert to fraction form
   7,900/12,726 = 12,726/x
3. Step 3: Cross multiply
   7,900x = 12,726 × 12,726
4. Step 4: Simplify right side
   7,900x = 161,951,076
5. Step 5: Solve for x
   x = 161,951,076/7,900
6. Step 6: Final answer
   x = 20,500.14