Finding the Fourth Proportional to 131.76, 181.60 and 118.72

Step by Step Solution

1. Step 1: Write the proportion equation
   131.76 : 181.60 = 118.72 : x
2. Step 2: Convert to fraction form
   131.76/181.60 = 118.72/x
3. Step 3: Cross multiply
   131.76x = 181.60 × 118.72
4. Step 4: Simplify right side
   131.76x = 21,559.55
5. Step 5: Solve for x
   x = 21,559.55/131.76
6. Step 6: Final answer
   x = 163.63