Finding the Third Proportional to 67.73 and 139.84

Step by Step Solution

1. Step 1: Write the proportion equation
   67.73 : 139.84 = 139.84 : x
2. Step 2: Convert to fraction form
   67.73/139.84 = 139.84/x
3. Step 3: Cross multiply
   67.73x = 139.84 × 139.84
4. Step 4: Simplify right side
   67.73x = 19,556.27
5. Step 5: Solve for x
   x = 19,556.27/67.73
6. Step 6: Final answer
   x = 288.72