Finding the Third Proportional to 99.50 and 130.75

Step by Step Solution

1. Step 1: Write the proportion equation
   99.50 : 130.75 = 130.75 : x
2. Step 2: Convert to fraction form
   99.50/130.75 = 130.75/x
3. Step 3: Cross multiply
   99.50x = 130.75 × 130.75
4. Step 4: Simplify right side
   99.50x = 17,095.56
5. Step 5: Solve for x
   x = 17,095.56/99.50
6. Step 6: Final answer
   x = 171.81