Finding the Third Proportional to 19,989 and 40,665

Step by Step Solution

1. Step 1: Write the proportion equation
   19,989 : 40,665 = 40,665 : x
2. Step 2: Convert to fraction form
   19,989/40,665 = 40,665/x
3. Step 3: Cross multiply
   19,989x = 40,665 × 40,665
4. Step 4: Simplify right side
   19,989x = 1,653,642,225
5. Step 5: Solve for x
   x = 1,653,642,225/19,989
6. Step 6: Final answer
   x = 82,727.61