Finding the Third Proportional to 518,345.50 and 811,357

Step by Step Solution

1. Step 1: Write the proportion equation
   518,345.50 : 811,357 = 811,357 : x
2. Step 2: Convert to fraction form
   518,345.50/811,357 = 811,357/x
3. Step 3: Cross multiply
   518,345.50x = 811,357 × 811,357
4. Step 4: Simplify right side
   518,345.50x = 658,300,181,449
5. Step 5: Solve for x
   x = 658,300,181,449/518,345.50
6. Step 6: Final answer
   x = 1,270,002.69