Finding the Third Proportional to 31,988.50 and 67,668

Step by Step Solution

1. Step 1: Write the proportion equation
   31,988.50 : 67,668 = 67,668 : x
2. Step 2: Convert to fraction form
   31,988.50/67,668 = 67,668/x
3. Step 3: Cross multiply
   31,988.50x = 67,668 × 67,668
4. Step 4: Simplify right side
   31,988.50x = 4,578,958,224
5. Step 5: Solve for x
   x = 4,578,958,224/31,988.50
6. Step 6: Final answer
   x = 143,143.89