Finding the Fourth Proportional to 111.55, 153.84 and 93.10

Step by Step Solution

1. Step 1: Write the proportion equation
   111.55 : 153.84 = 93.10 : x
2. Step 2: Convert to fraction form
   111.55/153.84 = 93.10/x
3. Step 3: Cross multiply
   111.55x = 153.84 × 93.10
4. Step 4: Simplify right side
   111.55x = 14,321.73
5. Step 5: Solve for x
   x = 14,321.73/111.55
6. Step 6: Final answer
   x = 128.39