Finding the Third Proportional to 31,990 and 68,606

Step by Step Solution

1. Step 1: Write the proportion equation
   31,990 : 68,606 = 68,606 : x
2. Step 2: Convert to fraction form
   31,990/68,606 = 68,606/x
3. Step 3: Cross multiply
   31,990x = 68,606 × 68,606
4. Step 4: Simplify right side
   31,990x = 4,706,783,236
5. Step 5: Solve for x
   x = 4,706,783,236/31,990
6. Step 6: Final answer
   x = 147,132.96