Finding the Third Proportional to 21,018 and 31,530

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018 : 31,530 = 31,530 : x
2. Step 2: Convert to fraction form
   21,018/31,530 = 31,530/x
3. Step 3: Cross multiply
   21,018x = 31,530 × 31,530
4. Step 4: Simplify right side
   21,018x = 994,140,900
5. Step 5: Solve for x
   x = 994,140,900/21,018
6. Step 6: Final answer
   x = 47,299.50