Finding the Fourth Proportional to 131.89, 181.99 and 76.61

Step by Step Solution

1. Step 1: Write the proportion equation
   131.89 : 181.99 = 76.61 : x
2. Step 2: Convert to fraction form
   131.89/181.99 = 76.61/x
3. Step 3: Cross multiply
   131.89x = 181.99 × 76.61
4. Step 4: Simplify right side
   131.89x = 13,940.96
5. Step 5: Solve for x
   x = 13,940.96/131.89
6. Step 6: Final answer
   x = 105.71