Finding the Fourth Proportional to 131.72, 181.72 and 79.96

Step by Step Solution

1. Step 1: Write the proportion equation
   131.72 : 181.72 = 79.96 : x
2. Step 2: Convert to fraction form
   131.72/181.72 = 79.96/x
3. Step 3: Cross multiply
   131.72x = 181.72 × 79.96
4. Step 4: Simplify right side
   131.72x = 14,530.33
5. Step 5: Solve for x
   x = 14,530.33/131.72
6. Step 6: Final answer
   x = 110.31