Finding the Fourth Proportional to 111.50, 153.89 and 93.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.50 : 153.89 = 93.99 : x
2. Step 2: Convert to fraction form
   111.50/153.89 = 93.99/x
3. Step 3: Cross multiply
   111.50x = 153.89 × 93.99
4. Step 4: Simplify right side
   111.50x = 14,464.12
5. Step 5: Solve for x
   x = 14,464.12/111.50
6. Step 6: Final answer
   x = 129.72