Finding the Third Proportional to 9,210 and 19,860

Step by Step Solution

1. Step 1: Write the proportion equation
   9,210 : 19,860 = 19,860 : x
2. Step 2: Convert to fraction form
   9,210/19,860 = 19,860/x
3. Step 3: Cross multiply
   9,210x = 19,860 × 19,860
4. Step 4: Simplify right side
   9,210x = 394,419,600
5. Step 5: Solve for x
   x = 394,419,600/9,210
6. Step 6: Final answer
   x = 42,825.15