Finding the Fourth Proportional to 111.42, 153.69 and 71.52

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.69 = 71.52 : x
2. Step 2: Convert to fraction form
   111.42/153.69 = 71.52/x
3. Step 3: Cross multiply
   111.42x = 153.69 × 71.52
4. Step 4: Simplify right side
   111.42x = 10,991.91
5. Step 5: Solve for x
   x = 10,991.91/111.42
6. Step 6: Final answer
   x = 98.65