Finding the Third Proportional to 10,200 and 21,042

Step by Step Solution

1. Step 1: Write the proportion equation
   10,200 : 21,042 = 21,042 : x
2. Step 2: Convert to fraction form
   10,200/21,042 = 21,042/x
3. Step 3: Cross multiply
   10,200x = 21,042 × 21,042
4. Step 4: Simplify right side
   10,200x = 442,765,764
5. Step 5: Solve for x
   x = 442,765,764/10,200
6. Step 6: Final answer
   x = 43,408.41