Finding the Fourth Proportional to 111.38, 153.63 and 83.73

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.63 = 83.73 : x
2. Step 2: Convert to fraction form
   111.38/153.63 = 83.73/x
3. Step 3: Cross multiply
   111.38x = 153.63 × 83.73
4. Step 4: Simplify right side
   111.38x = 12,864.37
5. Step 5: Solve for x
   x = 12,864.37/111.38
6. Step 6: Final answer
   x = 115.50