Finding the Fourth Proportional to 111.12, 153.27 and 83.58

Step by Step Solution

1. Step 1: Write the proportion equation
   111.12 : 153.27 = 83.58 : x
2. Step 2: Convert to fraction form
   111.12/153.27 = 83.58/x
3. Step 3: Cross multiply
   111.12x = 153.27 × 83.58
4. Step 4: Simplify right side
   111.12x = 12,810.31
5. Step 5: Solve for x
   x = 12,810.31/111.12
6. Step 6: Final answer
   x = 115.28