Finding the Third Proportional to 668,414 and 1,391,907

Step by Step Solution

1. Step 1: Write the proportion equation
   668,414 : 1,391,907 = 1,391,907 : x
2. Step 2: Convert to fraction form
   668,414/1,391,907 = 1,391,907/x
3. Step 3: Cross multiply
   668,414x = 1,391,907 × 1,391,907
4. Step 4: Simplify right side
   668,414x = 1,937,405,096,649
5. Step 5: Solve for x
   x = 1,937,405,096,649/668,414
6. Step 6: Final answer
   x = 2,898,510.65