Finding the Third Proportional to 10,380 and 21,245

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380 : 21,245 = 21,245 : x
2. Step 2: Convert to fraction form
   10,380/21,245 = 21,245/x
3. Step 3: Cross multiply
   10,380x = 21,245 × 21,245
4. Step 4: Simplify right side
   10,380x = 451,350,025
5. Step 5: Solve for x
   x = 451,350,025/10,380
6. Step 6: Final answer
   x = 43,482.66