Finding the Third Proportional to 518,364 and 811,404

Step by Step Solution

1. Step 1: Write the proportion equation
   518,364 : 811,404 = 811,404 : x
2. Step 2: Convert to fraction form
   518,364/811,404 = 811,404/x
3. Step 3: Cross multiply
   518,364x = 811,404 × 811,404
4. Step 4: Simplify right side
   518,364x = 658,376,451,216
5. Step 5: Solve for x
   x = 658,376,451,216/518,364
6. Step 6: Final answer
   x = 1,270,104.50