Finding the Fourth Proportional to 142.61, 196.79 and 79.59

Step by Step Solution

1. Step 1: Write the proportion equation
   142.61 : 196.79 = 79.59 : x
2. Step 2: Convert to fraction form
   142.61/196.79 = 79.59/x
3. Step 3: Cross multiply
   142.61x = 196.79 × 79.59
4. Step 4: Simplify right side
   142.61x = 15,661.83
5. Step 5: Solve for x
   x = 15,661.83/142.61
6. Step 6: Final answer
   x = 109.82