Finding the Third Proportional to 221,720 and 486,360

Step by Step Solution

1. Step 1: Write the proportion equation
   221,720 : 486,360 = 486,360 : x
2. Step 2: Convert to fraction form
   221,720/486,360 = 486,360/x
3. Step 3: Cross multiply
   221,720x = 486,360 × 486,360
4. Step 4: Simplify right side
   221,720x = 236,546,049,600
5. Step 5: Solve for x
   x = 236,546,049,600/221,720
6. Step 6: Final answer
   x = 1,066,868.35