Finding the Fourth Proportional to 74.76, 111.90 and 50.31

Step by Step Solution

1. Step 1: Write the proportion equation
   74.76 : 111.90 = 50.31 : x
2. Step 2: Convert to fraction form
   74.76/111.90 = 50.31/x
3. Step 3: Cross multiply
   74.76x = 111.90 × 50.31
4. Step 4: Simplify right side
   74.76x = 5,629.69
5. Step 5: Solve for x
   x = 5,629.69/74.76
6. Step 6: Final answer
   x = 75.30