Finding the Fourth Proportional to 111.39, 153.70 and 67.74

Step by Step Solution

1. Step 1: Write the proportion equation
   111.39 : 153.70 = 67.74 : x
2. Step 2: Convert to fraction form
   111.39/153.70 = 67.74/x
3. Step 3: Cross multiply
   111.39x = 153.70 × 67.74
4. Step 4: Simplify right side
   111.39x = 10,411.64
5. Step 5: Solve for x
   x = 10,411.64/111.39
6. Step 6: Final answer
   x = 93.47