Finding the Third Proportional to 1,212,206 and 1,818,309

Step by Step Solution

1. Step 1: Write the proportion equation
   1,212,206 : 1,818,309 = 1,818,309 : x
2. Step 2: Convert to fraction form
   1,212,206/1,818,309 = 1,818,309/x
3. Step 3: Cross multiply
   1,212,206x = 1,818,309 × 1,818,309
4. Step 4: Simplify right side
   1,212,206x = 3,306,247,619,481
5. Step 5: Solve for x
   x = 3,306,247,619,481/1,212,206
6. Step 6: Final answer
   x = 2,727,463.50