Finding the Fourth Proportional to 91.33, 136.86 and 39.96

Step by Step Solution

1. Step 1: Write the proportion equation
   91.33 : 136.86 = 39.96 : x
2. Step 2: Convert to fraction form
   91.33/136.86 = 39.96/x
3. Step 3: Cross multiply
   91.33x = 136.86 × 39.96
4. Step 4: Simplify right side
   91.33x = 5,468.78
5. Step 5: Solve for x
   x = 5,468.78/91.33
6. Step 6: Final answer
   x = 59.88