Finding the Third Proportional to 643,398 and 1,413,696

Step by Step Solution

1. Step 1: Write the proportion equation
   643,398 : 1,413,696 = 1,413,696 : x
2. Step 2: Convert to fraction form
   643,398/1,413,696 = 1,413,696/x
3. Step 3: Cross multiply
   643,398x = 1,413,696 × 1,413,696
4. Step 4: Simplify right side
   643,398x = 1,998,536,380,416
5. Step 5: Solve for x
   x = 1,998,536,380,416/643,398
6. Step 6: Final answer
   x = 3,106,221.00