Finding the Fourth Proportional to 111.86, 154.45 and 70.42

Step by Step Solution

1. Step 1: Write the proportion equation
   111.86 : 154.45 = 70.42 : x
2. Step 2: Convert to fraction form
   111.86/154.45 = 70.42/x
3. Step 3: Cross multiply
   111.86x = 154.45 × 70.42
4. Step 4: Simplify right side
   111.86x = 10,876.37
5. Step 5: Solve for x
   x = 10,876.37/111.86
6. Step 6: Final answer
   x = 97.23