Finding the Fourth Proportional to 111.42, 166.82 and 77.00

Step by Step Solution

1. Step 1: Write the proportion equation
   111.42 : 166.82 = 77.00 : x
2. Step 2: Convert to fraction form
   111.42/166.82 = 77.00/x
3. Step 3: Cross multiply
   111.42x = 166.82 × 77.00
4. Step 4: Simplify right side
   111.42x = 12,843.92
5. Step 5: Solve for x
   x = 12,843.92/111.42
6. Step 6: Final answer
   x = 115.27