Finding the Third Proportional to 138,568 and 297,856

Step by Step Solution

1. Step 1: Write the proportion equation
   138,568 : 297,856 = 297,856 : x
2. Step 2: Convert to fraction form
   138,568/297,856 = 297,856/x
3. Step 3: Cross multiply
   138,568x = 297,856 × 297,856
4. Step 4: Simplify right side
   138,568x = 88,718,196,736
5. Step 5: Solve for x
   x = 88,718,196,736/138,568
6. Step 6: Final answer
   x = 640,250.25