Finding the Fourth Proportional to 28.41, 42.55 and 19.83

Step by Step Solution

1. Step 1: Write the proportion equation
   28.41 : 42.55 = 19.83 : x
2. Step 2: Convert to fraction form
   28.41/42.55 = 19.83/x
3. Step 3: Cross multiply
   28.41x = 42.55 × 19.83
4. Step 4: Simplify right side
   28.41x = 843.72
5. Step 5: Solve for x
   x = 843.72/28.41
6. Step 6: Final answer
   x = 29.70