Finding the Fourth Proportional to 111.51, 153.83 and 83.84

Step by Step Solution

1. Step 1: Write the proportion equation
   111.51 : 153.83 = 83.84 : x
2. Step 2: Convert to fraction form
   111.51/153.83 = 83.84/x
3. Step 3: Cross multiply
   111.51x = 153.83 × 83.84
4. Step 4: Simplify right side
   111.51x = 12,896.37
5. Step 5: Solve for x
   x = 12,896.37/111.51
6. Step 6: Final answer
   x = 115.65