Finding the Third Proportional to 258,415 and 548,136.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,415 : 548,136.50 = 548,136.50 : x
2. Step 2: Convert to fraction form
   258,415/548,136.50 = 548,136.50/x
3. Step 3: Cross multiply
   258,415x = 548,136.50 × 548,136.50
4. Step 4: Simplify right side
   258,415x = 300,453,622,632.25
5. Step 5: Solve for x
   x = 300,453,622,632.25/258,415
6. Step 6: Final answer
   x = 1,162,678.72