Finding the Third Proportional to 639,748 and 1,377,912

Step by Step Solution

1. Step 1: Write the proportion equation
   639,748 : 1,377,912 = 1,377,912 : x
2. Step 2: Convert to fraction form
   639,748/1,377,912 = 1,377,912/x
3. Step 3: Cross multiply
   639,748x = 1,377,912 × 1,377,912
4. Step 4: Simplify right side
   639,748x = 1,898,641,479,744
5. Step 5: Solve for x
   x = 1,898,641,479,744/639,748
6. Step 6: Final answer
   x = 2,967,795.88