Finding the Fourth Proportional to 118.12, 162.94 and 76.72

Step by Step Solution

1. Step 1: Write the proportion equation
   118.12 : 162.94 = 76.72 : x
2. Step 2: Convert to fraction form
   118.12/162.94 = 76.72/x
3. Step 3: Cross multiply
   118.12x = 162.94 × 76.72
4. Step 4: Simplify right side
   118.12x = 12,500.76
5. Step 5: Solve for x
   x = 12,500.76/118.12
6. Step 6: Final answer
   x = 105.83