Finding the Fourth Proportional to 111.19, 153.39 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111.19 : 153.39 = 67.50 : x
2. Step 2: Convert to fraction form
   111.19/153.39 = 67.50/x
3. Step 3: Cross multiply
   111.19x = 153.39 × 67.50
4. Step 4: Simplify right side
   111.19x = 10,353.06
5. Step 5: Solve for x
   x = 10,353.06/111.19
6. Step 6: Final answer
   x = 93.11