Finding the Fourth Proportional to 131.99, 181.59 and 113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131.99 : 181.59 = 113.50 : x
2. Step 2: Convert to fraction form
   131.99/181.59 = 113.50/x
3. Step 3: Cross multiply
   131.99x = 181.59 × 113.50
4. Step 4: Simplify right side
   131.99x = 20,609.56
5. Step 5: Solve for x
   x = 20,609.56/131.99
6. Step 6: Final answer
   x = 156.14