Finding the Third Proportional to 258,522 and 388,056

Step by Step Solution

1. Step 1: Write the proportion equation
   258,522 : 388,056 = 388,056 : x
2. Step 2: Convert to fraction form
   258,522/388,056 = 388,056/x
3. Step 3: Cross multiply
   258,522x = 388,056 × 388,056
4. Step 4: Simplify right side
   258,522x = 150,587,459,136
5. Step 5: Solve for x
   x = 150,587,459,136/258,522
6. Step 6: Final answer
   x = 582,493.79