Finding the Third Proportional to 10,620 and 21,810

Step by Step Solution

1. Step 1: Write the proportion equation
   10,620 : 21,810 = 21,810 : x
2. Step 2: Convert to fraction form
   10,620/21,810 = 21,810/x
3. Step 3: Cross multiply
   10,620x = 21,810 × 21,810
4. Step 4: Simplify right side
   10,620x = 475,676,100
5. Step 5: Solve for x
   x = 475,676,100/10,620
6. Step 6: Final answer
   x = 44,790.59