Finding the Fourth Proportional to 111.38, 153.50 and 98.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.38 : 153.50 = 98.15 : x
2. Step 2: Convert to fraction form
   111.38/153.50 = 98.15/x
3. Step 3: Cross multiply
   111.38x = 153.50 × 98.15
4. Step 4: Simplify right side
   111.38x = 15,064.77
5. Step 5: Solve for x
   x = 15,064.77/111.38
6. Step 6: Final answer
   x = 135.26