Finding the Third Proportional to 31,839.50 and 68,870

Step by Step Solution

1. Step 1: Write the proportion equation
   31,839.50 : 68,870 = 68,870 : x
2. Step 2: Convert to fraction form
   31,839.50/68,870 = 68,870/x
3. Step 3: Cross multiply
   31,839.50x = 68,870 × 68,870
4. Step 4: Simplify right side
   31,839.50x = 4,743,076,900
5. Step 5: Solve for x
   x = 4,743,076,900/31,839.50
6. Step 6: Final answer
   x = 148,968.32