Finding the Third Proportional to 218,418 and 479,664

Step by Step Solution

1. Step 1: Write the proportion equation
   218,418 : 479,664 = 479,664 : x
2. Step 2: Convert to fraction form
   218,418/479,664 = 479,664/x
3. Step 3: Cross multiply
   218,418x = 479,664 × 479,664
4. Step 4: Simplify right side
   218,418x = 230,077,552,896
5. Step 5: Solve for x
   x = 230,077,552,896/218,418
6. Step 6: Final answer
   x = 1,053,381.83