Finding the Third Proportional to 68,303 and 139,978

Step by Step Solution

1. Step 1: Write the proportion equation
   68,303 : 139,978 = 139,978 : x
2. Step 2: Convert to fraction form
   68,303/139,978 = 139,978/x
3. Step 3: Cross multiply
   68,303x = 139,978 × 139,978
4. Step 4: Simplify right side
   68,303x = 19,593,840,484
5. Step 5: Solve for x
   x = 19,593,840,484/68,303
6. Step 6: Final answer
   x = 286,866.47