Finding the Fourth Proportional to 111.15, 153.25 and 74.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.15 : 153.25 = 74.31 : x
2. Step 2: Convert to fraction form
   111.15/153.25 = 74.31/x
3. Step 3: Cross multiply
   111.15x = 153.25 × 74.31
4. Step 4: Simplify right side
   111.15x = 11,388.01
5. Step 5: Solve for x
   x = 11,388.01/111.15
6. Step 6: Final answer
   x = 102.46