Finding the Fourth Proportional to 42.82, 59.05 and 28.99

Step by Step Solution

1. Step 1: Write the proportion equation
   42.82 : 59.05 = 28.99 : x
2. Step 2: Convert to fraction form
   42.82/59.05 = 28.99/x
3. Step 3: Cross multiply
   42.82x = 59.05 × 28.99
4. Step 4: Simplify right side
   42.82x = 1,711.86
5. Step 5: Solve for x
   x = 1,711.86/42.82
6. Step 6: Final answer
   x = 39.98