Finding the Fourth Proportional to 111.57, 153.86 and 83.94

Step by Step Solution

1. Step 1: Write the proportion equation
   111.57 : 153.86 = 83.94 : x
2. Step 2: Convert to fraction form
   111.57/153.86 = 83.94/x
3. Step 3: Cross multiply
   111.57x = 153.86 × 83.94
4. Step 4: Simplify right side
   111.57x = 12,914.59
5. Step 5: Solve for x
   x = 12,914.59/111.57
6. Step 6: Final answer
   x = 115.75