Finding the Third Proportional to 218,426 and 479,680

Step by Step Solution

1. Step 1: Write the proportion equation
   218,426 : 479,680 = 479,680 : x
2. Step 2: Convert to fraction form
   218,426/479,680 = 479,680/x
3. Step 3: Cross multiply
   218,426x = 479,680 × 479,680
4. Step 4: Simplify right side
   218,426x = 230,092,902,400
5. Step 5: Solve for x
   x = 230,092,902,400/218,426
6. Step 6: Final answer
   x = 1,053,413.52