Finding the Fourth Proportional to 79.91, 119.83 and 28.56

Step by Step Solution

1. Step 1: Write the proportion equation
   79.91 : 119.83 = 28.56 : x
2. Step 2: Convert to fraction form
   79.91/119.83 = 28.56/x
3. Step 3: Cross multiply
   79.91x = 119.83 × 28.56
4. Step 4: Simplify right side
   79.91x = 3,422.10
5. Step 5: Solve for x
   x = 3,422.10/79.91
6. Step 6: Final answer
   x = 42.83