Finding the Fourth Proportional to 113.33, 169.89 and 72.75

Step by Step Solution

1. Step 1: Write the proportion equation
   113.33 : 169.89 = 72.75 : x
2. Step 2: Convert to fraction form
   113.33/169.89 = 72.75/x
3. Step 3: Cross multiply
   113.33x = 169.89 × 72.75
4. Step 4: Simplify right side
   113.33x = 12,359.50
5. Step 5: Solve for x
   x = 12,359.50/113.33
6. Step 6: Final answer
   x = 109.06