Finding the Fourth Proportional to 111.19, 153.37 and 83.51

Step by Step Solution

1. Step 1: Write the proportion equation
   111.19 : 153.37 = 83.51 : x
2. Step 2: Convert to fraction form
   111.19/153.37 = 83.51/x
3. Step 3: Cross multiply
   111.19x = 153.37 × 83.51
4. Step 4: Simplify right side
   111.19x = 12,808.10
5. Step 5: Solve for x
   x = 12,808.10/111.19
6. Step 6: Final answer
   x = 115.19