Finding the Fourth Proportional to 111.95, 167.94 and 77.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.95 : 167.94 = 77.72 : x
2. Step 2: Convert to fraction form
   111.95/167.94 = 77.72/x
3. Step 3: Cross multiply
   111.95x = 167.94 × 77.72
4. Step 4: Simplify right side
   111.95x = 13,052.30
5. Step 5: Solve for x
   x = 13,052.30/111.95
6. Step 6: Final answer
   x = 116.59