Finding the Fourth Proportional to 92.76, 139.18 and 74.72

Step by Step Solution

1. Step 1: Write the proportion equation
   92.76 : 139.18 = 74.72 : x
2. Step 2: Convert to fraction form
   92.76/139.18 = 74.72/x
3. Step 3: Cross multiply
   92.76x = 139.18 × 74.72
4. Step 4: Simplify right side
   92.76x = 10,399.53
5. Step 5: Solve for x
   x = 10,399.53/92.76
6. Step 6: Final answer
   x = 112.11