Finding the Fourth Proportional to 111.82, 154.31 and 62.71

Step by Step Solution

1. Step 1: Write the proportion equation
   111.82 : 154.31 = 62.71 : x
2. Step 2: Convert to fraction form
   111.82/154.31 = 62.71/x
3. Step 3: Cross multiply
   111.82x = 154.31 × 62.71
4. Step 4: Simplify right side
   111.82x = 9,676.17
5. Step 5: Solve for x
   x = 9,676.17/111.82
6. Step 6: Final answer
   x = 86.53