Finding the Fourth Proportional to 113.33, 168.71 and 112.72

Step by Step Solution

1. Step 1: Write the proportion equation
   113.33 : 168.71 = 112.72 : x
2. Step 2: Convert to fraction form
   113.33/168.71 = 112.72/x
3. Step 3: Cross multiply
   113.33x = 168.71 × 112.72
4. Step 4: Simplify right side
   113.33x = 19,016.99
5. Step 5: Solve for x
   x = 19,016.99/113.33
6. Step 6: Final answer
   x = 167.80