Finding the Third Proportional to 643,112 and 1,396,936

Step by Step Solution

1. Step 1: Write the proportion equation
   643,112 : 1,396,936 = 1,396,936 : x
2. Step 2: Convert to fraction form
   643,112/1,396,936 = 1,396,936/x
3. Step 3: Cross multiply
   643,112x = 1,396,936 × 1,396,936
4. Step 4: Simplify right side
   643,112x = 1,951,430,188,096
5. Step 5: Solve for x
   x = 1,951,430,188,096/643,112
6. Step 6: Final answer
   x = 3,034,355.12