Finding the Third Proportional to 21,080 and 43,456

Step by Step Solution

1. Step 1: Write the proportion equation
   21,080 : 43,456 = 43,456 : x
2. Step 2: Convert to fraction form
   21,080/43,456 = 43,456/x
3. Step 3: Cross multiply
   21,080x = 43,456 × 43,456
4. Step 4: Simplify right side
   21,080x = 1,888,423,936
5. Step 5: Solve for x
   x = 1,888,423,936/21,080
6. Step 6: Final answer
   x = 89,583.68