Finding the Fourth Proportional to 111.10, 153.18 and 71.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.10 : 153.18 = 71.69 : x
2. Step 2: Convert to fraction form
   111.10/153.18 = 71.69/x
3. Step 3: Cross multiply
   111.10x = 153.18 × 71.69
4. Step 4: Simplify right side
   111.10x = 10,981.01
5. Step 5: Solve for x
   x = 10,981.01/111.10
6. Step 6: Final answer
   x = 98.84