Finding the Fourth Proportional to 91.27, 136.24 and 77.59

Step by Step Solution

1. Step 1: Write the proportion equation
   91.27 : 136.24 = 77.59 : x
2. Step 2: Convert to fraction form
   91.27/136.24 = 77.59/x
3. Step 3: Cross multiply
   91.27x = 136.24 × 77.59
4. Step 4: Simplify right side
   91.27x = 10,570.86
5. Step 5: Solve for x
   x = 10,570.86/91.27
6. Step 6: Final answer
   x = 115.82