Finding the Fourth Proportional to 111.31, 153.53 and 74.49

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 153.53 = 74.49 : x
2. Step 2: Convert to fraction form
   111.31/153.53 = 74.49/x
3. Step 3: Cross multiply
   111.31x = 153.53 × 74.49
4. Step 4: Simplify right side
   111.31x = 11,435.78
5. Step 5: Solve for x
   x = 11,435.78/111.31
6. Step 6: Final answer
   x = 102.74