Finding the Third Proportional to 87.69 and 130.56

Step by Step Solution

1. Step 1: Write the proportion equation
   87.69 : 130.56 = 130.56 : x
2. Step 2: Convert to fraction form
   87.69/130.56 = 130.56/x
3. Step 3: Cross multiply
   87.69x = 130.56 × 130.56
4. Step 4: Simplify right side
   87.69x = 17,046.57
5. Step 5: Solve for x
   x = 17,046.57/87.69
6. Step 6: Final answer
   x = 194.40