Finding the Third Proportional to 68,338 and 140,078

Step by Step Solution

1. Step 1: Write the proportion equation
   68,338 : 140,078 = 140,078 : x
2. Step 2: Convert to fraction form
   68,338/140,078 = 140,078/x
3. Step 3: Cross multiply
   68,338x = 140,078 × 140,078
4. Step 4: Simplify right side
   68,338x = 19,621,846,084
5. Step 5: Solve for x
   x = 19,621,846,084/68,338
6. Step 6: Final answer
   x = 287,129.36