Finding the Third Proportional to 280,494 and 612,388

Step by Step Solution

1. Step 1: Write the proportion equation
   280,494 : 612,388 = 612,388 : x
2. Step 2: Convert to fraction form
   280,494/612,388 = 612,388/x
3. Step 3: Cross multiply
   280,494x = 612,388 × 612,388
4. Step 4: Simplify right side
   280,494x = 375,019,062,544
5. Step 5: Solve for x
   x = 375,019,062,544/280,494
6. Step 6: Final answer
   x = 1,336,994.95