Finding the Third Proportional to 218,422 and 479,672

Step by Step Solution

1. Step 1: Write the proportion equation
   218,422 : 479,672 = 479,672 : x
2. Step 2: Convert to fraction form
   218,422/479,672 = 479,672/x
3. Step 3: Cross multiply
   218,422x = 479,672 × 479,672
4. Step 4: Simplify right side
   218,422x = 230,085,227,584
5. Step 5: Solve for x
   x = 230,085,227,584/218,422
6. Step 6: Final answer
   x = 1,053,397.68