Finding the Third Proportional to 258,390 and 548,086.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,390 : 548,086.50 = 548,086.50 : x
2. Step 2: Convert to fraction form
   258,390/548,086.50 = 548,086.50/x
3. Step 3: Cross multiply
   258,390x = 548,086.50 × 548,086.50
4. Step 4: Simplify right side
   258,390x = 300,398,811,482.25
5. Step 5: Solve for x
   x = 300,398,811,482.25/258,390
6. Step 6: Final answer
   x = 1,162,579.09