Finding the Third Proportional to 258,492 and 558,494

Step by Step Solution

1. Step 1: Write the proportion equation
   258,492 : 558,494 = 558,494 : x
2. Step 2: Convert to fraction form
   258,492/558,494 = 558,494/x
3. Step 3: Cross multiply
   258,492x = 558,494 × 558,494
4. Step 4: Simplify right side
   258,492x = 311,915,548,036
5. Step 5: Solve for x
   x = 311,915,548,036/258,492
6. Step 6: Final answer
   x = 1,206,673.89