Finding the Third Proportional to 31,459.50 and 67,221

Step by Step Solution

1. Step 1: Write the proportion equation
   31,459.50 : 67,221 = 67,221 : x
2. Step 2: Convert to fraction form
   31,459.50/67,221 = 67,221/x
3. Step 3: Cross multiply
   31,459.50x = 67,221 × 67,221
4. Step 4: Simplify right side
   31,459.50x = 4,518,662,841
5. Step 5: Solve for x
   x = 4,518,662,841/31,459.50
6. Step 6: Final answer
   x = 143,634.29