Finding the Fourth Proportional to 91.29, 136.82 and 39.88

Step by Step Solution

1. Step 1: Write the proportion equation
   91.29 : 136.82 = 39.88 : x
2. Step 2: Convert to fraction form
   91.29/136.82 = 39.88/x
3. Step 3: Cross multiply
   91.29x = 136.82 × 39.88
4. Step 4: Simplify right side
   91.29x = 5,456.38
5. Step 5: Solve for x
   x = 5,456.38/91.29
6. Step 6: Final answer
   x = 59.77