Finding the Third Proportional to 12,958 and 20,009

Step by Step Solution

1. Step 1: Write the proportion equation
   12,958 : 20,009 = 20,009 : x
2. Step 2: Convert to fraction form
   12,958/20,009 = 20,009/x
3. Step 3: Cross multiply
   12,958x = 20,009 × 20,009
4. Step 4: Simplify right side
   12,958x = 400,360,081
5. Step 5: Solve for x
   x = 400,360,081/12,958
6. Step 6: Final answer
   x = 30,896.75