Finding the Third Proportional to 340,885 and 743,978

Step by Step Solution

1. Step 1: Write the proportion equation
   340,885 : 743,978 = 743,978 : x
2. Step 2: Convert to fraction form
   340,885/743,978 = 743,978/x
3. Step 3: Cross multiply
   340,885x = 743,978 × 743,978
4. Step 4: Simplify right side
   340,885x = 553,503,264,484
5. Step 5: Solve for x
   x = 553,503,264,484/340,885
6. Step 6: Final answer
   x = 1,623,724.32