Finding the Third Proportional to 30,212 and 64,799

Step by Step Solution

1. Step 1: Write the proportion equation
   30,212 : 64,799 = 64,799 : x
2. Step 2: Convert to fraction form
   30,212/64,799 = 64,799/x
3. Step 3: Cross multiply
   30,212x = 64,799 × 64,799
4. Step 4: Simplify right side
   30,212x = 4,198,910,401
5. Step 5: Solve for x
   x = 4,198,910,401/30,212
6. Step 6: Final answer
   x = 138,981.54