Finding the Third Proportional to 318,856 and 479,040

Step by Step Solution

1. Step 1: Write the proportion equation
   318,856 : 479,040 = 479,040 : x
2. Step 2: Convert to fraction form
   318,856/479,040 = 479,040/x
3. Step 3: Cross multiply
   318,856x = 479,040 × 479,040
4. Step 4: Simplify right side
   318,856x = 229,479,321,600
5. Step 5: Solve for x
   x = 229,479,321,600/318,856
6. Step 6: Final answer
   x = 719,695.79