Finding the Third Proportional to 67,063.50 and 139,638

Step by Step Solution

1. Step 1: Write the proportion equation
   67,063.50 : 139,638 = 139,638 : x
2. Step 2: Convert to fraction form
   67,063.50/139,638 = 139,638/x
3. Step 3: Cross multiply
   67,063.50x = 139,638 × 139,638
4. Step 4: Simplify right side
   67,063.50x = 19,498,771,044
5. Step 5: Solve for x
   x = 19,498,771,044/67,063.50
6. Step 6: Final answer
   x = 290,750.87