Finding the Third Proportional to 639,968 and 1,374,907

Step by Step Solution

1. Step 1: Write the proportion equation
   639,968 : 1,374,907 = 1,374,907 : x
2. Step 2: Convert to fraction form
   639,968/1,374,907 = 1,374,907/x
3. Step 3: Cross multiply
   639,968x = 1,374,907 × 1,374,907
4. Step 4: Simplify right side
   639,968x = 1,890,369,258,649
5. Step 5: Solve for x
   x = 1,890,369,258,649/639,968
6. Step 6: Final answer
   x = 2,953,849.66