Finding the Fourth Proportional to 111.09, 153.31 and 83.41

Step by Step Solution

1. Step 1: Write the proportion equation
   111.09 : 153.31 = 83.41 : x
2. Step 2: Convert to fraction form
   111.09/153.31 = 83.41/x
3. Step 3: Cross multiply
   111.09x = 153.31 × 83.41
4. Step 4: Simplify right side
   111.09x = 12,787.03
5. Step 5: Solve for x
   x = 12,787.03/111.09
6. Step 6: Final answer
   x = 115.11