Finding the Fourth Proportional to 111.56, 153.89 and 74.17

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.89 = 74.17 : x
2. Step 2: Convert to fraction form
   111.56/153.89 = 74.17/x
3. Step 3: Cross multiply
   111.56x = 153.89 × 74.17
4. Step 4: Simplify right side
   111.56x = 11,414.76
5. Step 5: Solve for x
   x = 11,414.76/111.56
6. Step 6: Final answer
   x = 102.32