Finding the Third Proportional to 12,921 and 20,004

Step by Step Solution

1. Step 1: Write the proportion equation
   12,921 : 20,004 = 20,004 : x
2. Step 2: Convert to fraction form
   12,921/20,004 = 20,004/x
3. Step 3: Cross multiply
   12,921x = 20,004 × 20,004
4. Step 4: Simplify right side
   12,921x = 400,160,016
5. Step 5: Solve for x
   x = 400,160,016/12,921
6. Step 6: Final answer
   x = 30,969.74