Finding the Third Proportional to 664,391 and 1,030,728

Step by Step Solution

1. Step 1: Write the proportion equation
   664,391 : 1,030,728 = 1,030,728 : x
2. Step 2: Convert to fraction form
   664,391/1,030,728 = 1,030,728/x
3. Step 3: Cross multiply
   664,391x = 1,030,728 × 1,030,728
4. Step 4: Simplify right side
   664,391x = 1,062,400,209,984
5. Step 5: Solve for x
   x = 1,062,400,209,984/664,391
6. Step 6: Final answer
   x = 1,599,058.70