Finding the Third Proportional to 638,000 and 1,391,912

Step by Step Solution

1. Step 1: Write the proportion equation
   638,000 : 1,391,912 = 1,391,912 : x
2. Step 2: Convert to fraction form
   638,000/1,391,912 = 1,391,912/x
3. Step 3: Cross multiply
   638,000x = 1,391,912 × 1,391,912
4. Step 4: Simplify right side
   638,000x = 1,937,419,015,744
5. Step 5: Solve for x
   x = 1,937,419,015,744/638,000
6. Step 6: Final answer
   x = 3,036,706.92