Finding the Fourth Proportional to 91.61, 136.82 and 79.46

Step by Step Solution

1. Step 1: Write the proportion equation
   91.61 : 136.82 = 79.46 : x
2. Step 2: Convert to fraction form
   91.61/136.82 = 79.46/x
3. Step 3: Cross multiply
   91.61x = 136.82 × 79.46
4. Step 4: Simplify right side
   91.61x = 10,871.72
5. Step 5: Solve for x
   x = 10,871.72/91.61
6. Step 6: Final answer
   x = 118.67