Finding the Third Proportional to 687,128 and 1,496,243

Step by Step Solution

1. Step 1: Write the proportion equation
   687,128 : 1,496,243 = 1,496,243 : x
2. Step 2: Convert to fraction form
   687,128/1,496,243 = 1,496,243/x
3. Step 3: Cross multiply
   687,128x = 1,496,243 × 1,496,243
4. Step 4: Simplify right side
   687,128x = 2,238,743,115,049
5. Step 5: Solve for x
   x = 2,238,743,115,049/687,128
6. Step 6: Final answer
   x = 3,258,116.56