Finding the Third Proportional to 68,285 and 139,945

Step by Step Solution

1. Step 1: Write the proportion equation
   68,285 : 139,945 = 139,945 : x
2. Step 2: Convert to fraction form
   68,285/139,945 = 139,945/x
3. Step 3: Cross multiply
   68,285x = 139,945 × 139,945
4. Step 4: Simplify right side
   68,285x = 19,584,603,025
5. Step 5: Solve for x
   x = 19,584,603,025/68,285
6. Step 6: Final answer
   x = 286,806.81