Finding the Fourth Proportional to 111.17, 153.45 and 67.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111.17 : 153.45 = 67.50 : x
2. Step 2: Convert to fraction form
   111.17/153.45 = 67.50/x
3. Step 3: Cross multiply
   111.17x = 153.45 × 67.50
4. Step 4: Simplify right side
   111.17x = 10,357.88
5. Step 5: Solve for x
   x = 10,357.88/111.17
6. Step 6: Final answer
   x = 93.17