Finding the Fourth Proportional to 42.63, 58.77 and 28.05

Step by Step Solution

1. Step 1: Write the proportion equation
   42.63 : 58.77 = 28.05 : x
2. Step 2: Convert to fraction form
   42.63/58.77 = 28.05/x
3. Step 3: Cross multiply
   42.63x = 58.77 × 28.05
4. Step 4: Simplify right side
   42.63x = 1,648.50
5. Step 5: Solve for x
   x = 1,648.50/42.63
6. Step 6: Final answer
   x = 38.67