Finding the Fourth Proportional to 111.96, 167.98 and 51.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.96 : 167.98 = 51.15 : x
2. Step 2: Convert to fraction form
   111.96/167.98 = 51.15/x
3. Step 3: Cross multiply
   111.96x = 167.98 × 51.15
4. Step 4: Simplify right side
   111.96x = 8,592.18
5. Step 5: Solve for x
   x = 8,592.18/111.96
6. Step 6: Final answer
   x = 76.74