Finding the Third Proportional to 221,556 and 487,398

Step by Step Solution

1. Step 1: Write the proportion equation
   221,556 : 487,398 = 487,398 : x
2. Step 2: Convert to fraction form
   221,556/487,398 = 487,398/x
3. Step 3: Cross multiply
   221,556x = 487,398 × 487,398
4. Step 4: Simplify right side
   221,556x = 237,556,810,404
5. Step 5: Solve for x
   x = 237,556,810,404/221,556
6. Step 6: Final answer
   x = 1,072,220.16