Finding the Third Proportional to 21,089 and 43,231

Step by Step Solution

1. Step 1: Write the proportion equation
   21,089 : 43,231 = 43,231 : x
2. Step 2: Convert to fraction form
   21,089/43,231 = 43,231/x
3. Step 3: Cross multiply
   21,089x = 43,231 × 43,231
4. Step 4: Simplify right side
   21,089x = 1,868,919,361
5. Step 5: Solve for x
   x = 1,868,919,361/21,089
6. Step 6: Final answer
   x = 88,620.58