Finding the Third Proportional to 221,690 and 486,272

Step by Step Solution

1. Step 1: Write the proportion equation
   221,690 : 486,272 = 486,272 : x
2. Step 2: Convert to fraction form
   221,690/486,272 = 486,272/x
3. Step 3: Cross multiply
   221,690x = 486,272 × 486,272
4. Step 4: Simplify right side
   221,690x = 236,460,457,984
5. Step 5: Solve for x
   x = 236,460,457,984/221,690
6. Step 6: Final answer
   x = 1,066,626.63