Finding the Third Proportional to 309,640.22 and 512,461.69

Step by Step Solution

1. Step 1: Write the proportion equation
   309,640.22 : 512,461.69 = 512,461.69 : x
2. Step 2: Convert to fraction form
   309,640.22/512,461.69 = 512,461.69/x
3. Step 3: Cross multiply
   309,640.22x = 512,461.69 × 512,461.69
4. Step 4: Simplify right side
   309,640.22x = 262,616,981,155.35
5. Step 5: Solve for x
   x = 262,616,981,155.35/309,640.22
6. Step 6: Final answer
   x = 848,135.89