Finding the Fourth Proportional to 111.31, 166.71 and 65.70

Step by Step Solution

1. Step 1: Write the proportion equation
   111.31 : 166.71 = 65.70 : x
2. Step 2: Convert to fraction form
   111.31/166.71 = 65.70/x
3. Step 3: Cross multiply
   111.31x = 166.71 × 65.70
4. Step 4: Simplify right side
   111.31x = 10,952.85
5. Step 5: Solve for x
   x = 10,952.85/111.31
6. Step 6: Final answer
   x = 98.40