Finding the Third Proportional to 258,422 and 548,150

Step by Step Solution

1. Step 1: Write the proportion equation
   258,422 : 548,150 = 548,150 : x
2. Step 2: Convert to fraction form
   258,422/548,150 = 548,150/x
3. Step 3: Cross multiply
   258,422x = 548,150 × 548,150
4. Step 4: Simplify right side
   258,422x = 300,468,422,500
5. Step 5: Solve for x
   x = 300,468,422,500/258,422
6. Step 6: Final answer
   x = 1,162,704.50