Finding the Third Proportional to 31,718 and 68,308

Step by Step Solution

1. Step 1: Write the proportion equation
   31,718 : 68,308 = 68,308 : x
2. Step 2: Convert to fraction form
   31,718/68,308 = 68,308/x
3. Step 3: Cross multiply
   31,718x = 68,308 × 68,308
4. Step 4: Simplify right side
   31,718x = 4,665,982,864
5. Step 5: Solve for x
   x = 4,665,982,864/31,718
6. Step 6: Final answer
   x = 147,108.36