Finding the Fourth Proportional to 131.91, 181.98 and 89.34

Step by Step Solution

1. Step 1: Write the proportion equation
   131.91 : 181.98 = 89.34 : x
2. Step 2: Convert to fraction form
   131.91/181.98 = 89.34/x
3. Step 3: Cross multiply
   131.91x = 181.98 × 89.34
4. Step 4: Simplify right side
   131.91x = 16,258.09
5. Step 5: Solve for x
   x = 16,258.09/131.91
6. Step 6: Final answer
   x = 123.25