Finding the Third Proportional to 86.69 and 130.59

Step by Step Solution

1. Step 1: Write the proportion equation
   86.69 : 130.59 = 130.59 : x
2. Step 2: Convert to fraction form
   86.69/130.59 = 130.59/x
3. Step 3: Cross multiply
   86.69x = 130.59 × 130.59
4. Step 4: Simplify right side
   86.69x = 17,054.73
5. Step 5: Solve for x
   x = 17,054.73/86.69
6. Step 6: Final answer
   x = 196.74