Finding the Third Proportional to 1,211,357 and 1,645,839

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211,357 : 1,645,839 = 1,645,839 : x
2. Step 2: Convert to fraction form
   1,211,357/1,645,839 = 1,645,839/x
3. Step 3: Cross multiply
   1,211,357x = 1,645,839 × 1,645,839
4. Step 4: Simplify right side
   1,211,357x = 2,708,786,013,921
5. Step 5: Solve for x
   x = 2,708,786,013,921/1,211,357
6. Step 6: Final answer
   x = 2,236,158.30