Finding the Third Proportional to 31,989 and 67,669

Step by Step Solution

1. Step 1: Write the proportion equation
   31,989 : 67,669 = 67,669 : x
2. Step 2: Convert to fraction form
   31,989/67,669 = 67,669/x
3. Step 3: Cross multiply
   31,989x = 67,669 × 67,669
4. Step 4: Simplify right side
   31,989x = 4,579,093,561
5. Step 5: Solve for x
   x = 4,579,093,561/31,989
6. Step 6: Final answer
   x = 143,145.88