Finding the Third Proportional to 664,290 and 1,057,519

Step by Step Solution

1. Step 1: Write the proportion equation
   664,290 : 1,057,519 = 1,057,519 : x
2. Step 2: Convert to fraction form
   664,290/1,057,519 = 1,057,519/x
3. Step 3: Cross multiply
   664,290x = 1,057,519 × 1,057,519
4. Step 4: Simplify right side
   664,290x = 1,118,346,435,361
5. Step 5: Solve for x
   x = 1,118,346,435,361/664,290
6. Step 6: Final answer
   x = 1,683,521.41