Finding the Third Proportional to 9,830 and 21,230

Step by Step Solution

1. Step 1: Write the proportion equation
   9,830 : 21,230 = 21,230 : x
2. Step 2: Convert to fraction form
   9,830/21,230 = 21,230/x
3. Step 3: Cross multiply
   9,830x = 21,230 × 21,230
4. Step 4: Simplify right side
   9,830x = 450,712,900
5. Step 5: Solve for x
   x = 450,712,900/9,830
6. Step 6: Final answer
   x = 45,850.75