Finding the Third Proportional to 258,651 and 388,282.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,651 : 388,282.50 = 388,282.50 : x
2. Step 2: Convert to fraction form
   258,651/388,282.50 = 388,282.50/x
3. Step 3: Cross multiply
   258,651x = 388,282.50 × 388,282.50
4. Step 4: Simplify right side
   258,651x = 150,763,299,806.25
5. Step 5: Solve for x
   x = 150,763,299,806.25/258,651
6. Step 6: Final answer
   x = 582,883.11