Finding the Fourth Proportional to 111.17, 153.23 and 100.17

Step by Step Solution

1. Step 1: Write the proportion equation
   111.17 : 153.23 = 100.17 : x
2. Step 2: Convert to fraction form
   111.17/153.23 = 100.17/x
3. Step 3: Cross multiply
   111.17x = 153.23 × 100.17
4. Step 4: Simplify right side
   111.17x = 15,348.55
5. Step 5: Solve for x
   x = 15,348.55/111.17
6. Step 6: Final answer
   x = 138.06