Finding the Fourth Proportional to 111.61, 153.93 and 74.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.61 : 153.93 = 74.72 : x
2. Step 2: Convert to fraction form
   111.61/153.93 = 74.72/x
3. Step 3: Cross multiply
   111.61x = 153.93 × 74.72
4. Step 4: Simplify right side
   111.61x = 11,502.03
5. Step 5: Solve for x
   x = 11,502.03/111.61
6. Step 6: Final answer
   x = 103.06