Finding the Third Proportional to 221,508 and 487,320

Step by Step Solution

1. Step 1: Write the proportion equation
   221,508 : 487,320 = 487,320 : x
2. Step 2: Convert to fraction form
   221,508/487,320 = 487,320/x
3. Step 3: Cross multiply
   221,508x = 487,320 × 487,320
4. Step 4: Simplify right side
   221,508x = 237,480,782,400
5. Step 5: Solve for x
   x = 237,480,782,400/221,508
6. Step 6: Final answer
   x = 1,072,109.28