Finding the Third Proportional to 338,044.50 and 685,422

Step by Step Solution

1. Step 1: Write the proportion equation
   338,044.50 : 685,422 = 685,422 : x
2. Step 2: Convert to fraction form
   338,044.50/685,422 = 685,422/x
3. Step 3: Cross multiply
   338,044.50x = 685,422 × 685,422
4. Step 4: Simplify right side
   338,044.50x = 469,803,318,084
5. Step 5: Solve for x
   x = 469,803,318,084/338,044.50
6. Step 6: Final answer
   x = 1,389,767.67