Finding the Third Proportional to 808,144 and 1,212,216

Step by Step Solution

1. Step 1: Write the proportion equation
   808,144 : 1,212,216 = 1,212,216 : x
2. Step 2: Convert to fraction form
   808,144/1,212,216 = 1,212,216/x
3. Step 3: Cross multiply
   808,144x = 1,212,216 × 1,212,216
4. Step 4: Simplify right side
   808,144x = 1,469,467,630,656
5. Step 5: Solve for x
   x = 1,469,467,630,656/808,144
6. Step 6: Final answer
   x = 1,818,324