Finding the Third Proportional to 86.73 and 139.71

Step by Step Solution

1. Step 1: Write the proportion equation
   86.73 : 139.71 = 139.71 : x
2. Step 2: Convert to fraction form
   86.73/139.71 = 139.71/x
3. Step 3: Cross multiply
   86.73x = 139.71 × 139.71
4. Step 4: Simplify right side
   86.73x = 19,519.15
5. Step 5: Solve for x
   x = 19,519.15/86.73
6. Step 6: Final answer
   x = 225.06