Finding the Fourth Proportional to 42.72, 58.83 and 35.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 58.83 = 35.81 : x
2. Step 2: Convert to fraction form
   42.72/58.83 = 35.81/x
3. Step 3: Cross multiply
   42.72x = 58.83 × 35.81
4. Step 4: Simplify right side
   42.72x = 2,106.41
5. Step 5: Solve for x
   x = 2,106.41/42.72
6. Step 6: Final answer
   x = 49.31