Finding the Fourth Proportional to 116.42, 160.61 and 79.61

Step by Step Solution

1. Step 1: Write the proportion equation
   116.42 : 160.61 = 79.61 : x
2. Step 2: Convert to fraction form
   116.42/160.61 = 79.61/x
3. Step 3: Cross multiply
   116.42x = 160.61 × 79.61
4. Step 4: Simplify right side
   116.42x = 12,784.96
5. Step 5: Solve for x
   x = 12,784.96/116.42
6. Step 6: Final answer
   x = 109.82