Finding the Fourth Proportional to 131.97, 181.86 and 99.15

Step by Step Solution

1. Step 1: Write the proportion equation
   131.97 : 181.86 = 99.15 : x
2. Step 2: Convert to fraction form
   131.97/181.86 = 99.15/x
3. Step 3: Cross multiply
   131.97x = 181.86 × 99.15
4. Step 4: Simplify right side
   131.97x = 18,031.42
5. Step 5: Solve for x
   x = 18,031.42/131.97
6. Step 6: Final answer
   x = 136.63