Finding the Fourth Proportional to 83.83, 126.38 and 79.42

Step by Step Solution

1. Step 1: Write the proportion equation
   83.83 : 126.38 = 79.42 : x
2. Step 2: Convert to fraction form
   83.83/126.38 = 79.42/x
3. Step 3: Cross multiply
   83.83x = 126.38 × 79.42
4. Step 4: Simplify right side
   83.83x = 10,037.10
5. Step 5: Solve for x
   x = 10,037.10/83.83
6. Step 6: Final answer
   x = 119.73