Finding the Third Proportional to 10,420 and 21,929

Step by Step Solution

1. Step 1: Write the proportion equation
   10,420 : 21,929 = 21,929 : x
2. Step 2: Convert to fraction form
   10,420/21,929 = 21,929/x
3. Step 3: Cross multiply
   10,420x = 21,929 × 21,929
4. Step 4: Simplify right side
   10,420x = 480,881,041
5. Step 5: Solve for x
   x = 480,881,041/10,420
6. Step 6: Final answer
   x = 46,149.81