Finding the Third Proportional to 86.45 and 133.31

Step by Step Solution

1. Step 1: Write the proportion equation
   86.45 : 133.31 = 133.31 : x
2. Step 2: Convert to fraction form
   86.45/133.31 = 133.31/x
3. Step 3: Cross multiply
   86.45x = 133.31 × 133.31
4. Step 4: Simplify right side
   86.45x = 17,772.22
5. Step 5: Solve for x
   x = 17,772.22/86.45
6. Step 6: Final answer
   x = 205.58