Finding the Fourth Proportional to 111.42, 153.56 and 98.69

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.56 = 98.69 : x
2. Step 2: Convert to fraction form
   111.42/153.56 = 98.69/x
3. Step 3: Cross multiply
   111.42x = 153.56 × 98.69
4. Step 4: Simplify right side
   111.42x = 15,154.84
5. Step 5: Solve for x
   x = 15,154.84/111.42
6. Step 6: Final answer
   x = 136.02