Finding the Fourth Proportional to 111.42, 153.77 and 62.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 153.77 = 62.31 : x
2. Step 2: Convert to fraction form
   111.42/153.77 = 62.31/x
3. Step 3: Cross multiply
   111.42x = 153.77 × 62.31
4. Step 4: Simplify right side
   111.42x = 9,581.41
5. Step 5: Solve for x
   x = 9,581.41/111.42
6. Step 6: Final answer
   x = 85.99