Finding the Third Proportional to 21,018 and 43,086

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018 : 43,086 = 43,086 : x
2. Step 2: Convert to fraction form
   21,018/43,086 = 43,086/x
3. Step 3: Cross multiply
   21,018x = 43,086 × 43,086
4. Step 4: Simplify right side
   21,018x = 1,856,403,396
5. Step 5: Solve for x
   x = 1,856,403,396/21,018
6. Step 6: Final answer
   x = 88,324.46