Finding the Third Proportional to 258,518 and 388,050

Step by Step Solution

1. Step 1: Write the proportion equation
   258,518 : 388,050 = 388,050 : x
2. Step 2: Convert to fraction form
   258,518/388,050 = 388,050/x
3. Step 3: Cross multiply
   258,518x = 388,050 × 388,050
4. Step 4: Simplify right side
   258,518x = 150,582,802,500
5. Step 5: Solve for x
   x = 150,582,802,500/258,518
6. Step 6: Final answer
   x = 582,484.79