Finding the Third Proportional to 31,722 and 68,790

Step by Step Solution

1. Step 1: Write the proportion equation
   31,722 : 68,790 = 68,790 : x
2. Step 2: Convert to fraction form
   31,722/68,790 = 68,790/x
3. Step 3: Cross multiply
   31,722x = 68,790 × 68,790
4. Step 4: Simplify right side
   31,722x = 4,732,064,100
5. Step 5: Solve for x
   x = 4,732,064,100/31,722
6. Step 6: Final answer
   x = 149,172.94