Finding the Fourth Proportional to 111.91, 167.52 and 77.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 167.52 = 77.47 : x
2. Step 2: Convert to fraction form
   111.91/167.52 = 77.47/x
3. Step 3: Cross multiply
   111.91x = 167.52 × 77.47
4. Step 4: Simplify right side
   111.91x = 12,977.77
5. Step 5: Solve for x
   x = 12,977.77/111.91
6. Step 6: Final answer
   x = 115.97