Finding the Third Proportional to 356,872 and 743,345

Step by Step Solution

1. Step 1: Write the proportion equation
   356,872 : 743,345 = 743,345 : x
2. Step 2: Convert to fraction form
   356,872/743,345 = 743,345/x
3. Step 3: Cross multiply
   356,872x = 743,345 × 743,345
4. Step 4: Simplify right side
   356,872x = 552,561,789,025
5. Step 5: Solve for x
   x = 552,561,789,025/356,872
6. Step 6: Final answer
   x = 1,548,347.28