Finding the Fourth Proportional to 111.13, 153.37 and 83.63

Step by Step Solution

1. Step 1: Write the proportion equation
   111.13 : 153.37 = 83.63 : x
2. Step 2: Convert to fraction form
   111.13/153.37 = 83.63/x
3. Step 3: Cross multiply
   111.13x = 153.37 × 83.63
4. Step 4: Simplify right side
   111.13x = 12,826.33
5. Step 5: Solve for x
   x = 12,826.33/111.13
6. Step 6: Final answer
   x = 115.42