Finding the Third Proportional to 30,729.25 and 67,020.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,729.25 : 67,020.50 = 67,020.50 : x
2. Step 2: Convert to fraction form
   30,729.25/67,020.50 = 67,020.50/x
3. Step 3: Cross multiply
   30,729.25x = 67,020.50 × 67,020.50
4. Step 4: Simplify right side
   30,729.25x = 4,491,747,420.25
5. Step 5: Solve for x
   x = 4,491,747,420.25/30,729.25
6. Step 6: Final answer
   x = 146,171.72