Finding the Third Proportional to 21,008 and 42,976

Step by Step Solution

1. Step 1: Write the proportion equation
   21,008 : 42,976 = 42,976 : x
2. Step 2: Convert to fraction form
   21,008/42,976 = 42,976/x
3. Step 3: Cross multiply
   21,008x = 42,976 × 42,976
4. Step 4: Simplify right side
   21,008x = 1,846,936,576
5. Step 5: Solve for x
   x = 1,846,936,576/21,008
6. Step 6: Final answer
   x = 87,915.87