Finding the Third Proportional to 643,396 and 1,413,692

Step by Step Solution

1. Step 1: Write the proportion equation
   643,396 : 1,413,692 = 1,413,692 : x
2. Step 2: Convert to fraction form
   643,396/1,413,692 = 1,413,692/x
3. Step 3: Cross multiply
   643,396x = 1,413,692 × 1,413,692
4. Step 4: Simplify right side
   643,396x = 1,998,525,070,864
5. Step 5: Solve for x
   x = 1,998,525,070,864/643,396
6. Step 6: Final answer
   x = 3,106,213.08