Finding the Third Proportional to 259,710 and 388,530

Step by Step Solution

1. Step 1: Write the proportion equation
   259,710 : 388,530 = 388,530 : x
2. Step 2: Convert to fraction form
   259,710/388,530 = 388,530/x
3. Step 3: Cross multiply
   259,710x = 388,530 × 388,530
4. Step 4: Simplify right side
   259,710x = 150,955,560,900
5. Step 5: Solve for x
   x = 150,955,560,900/259,710
6. Step 6: Final answer
   x = 581,246.62