Finding the Third Proportional to 311,105.25 and 664,857

Step by Step Solution

1. Step 1: Write the proportion equation
   311,105.25 : 664,857 = 664,857 : x
2. Step 2: Convert to fraction form
   311,105.25/664,857 = 664,857/x
3. Step 3: Cross multiply
   311,105.25x = 664,857 × 664,857
4. Step 4: Simplify right side
   311,105.25x = 442,034,830,449
5. Step 5: Solve for x
   x = 442,034,830,449/311,105.25
6. Step 6: Final answer
   x = 1,420,853.01