Finding the Third Proportional to 10,980 and 21,405

Step by Step Solution

1. Step 1: Write the proportion equation
   10,980 : 21,405 = 21,405 : x
2. Step 2: Convert to fraction form
   10,980/21,405 = 21,405/x
3. Step 3: Cross multiply
   10,980x = 21,405 × 21,405
4. Step 4: Simplify right side
   10,980x = 458,174,025
5. Step 5: Solve for x
   x = 458,174,025/10,980
6. Step 6: Final answer
   x = 41,728.05