Finding the Third Proportional to 218,422 and 479,670

Step by Step Solution

1. Step 1: Write the proportion equation
   218,422 : 479,670 = 479,670 : x
2. Step 2: Convert to fraction form
   218,422/479,670 = 479,670/x
3. Step 3: Cross multiply
   218,422x = 479,670 × 479,670
4. Step 4: Simplify right side
   218,422x = 230,083,308,900
5. Step 5: Solve for x
   x = 230,083,308,900/218,422
6. Step 6: Final answer
   x = 1,053,388.89