Finding the Fourth Proportional to 42.63, 58.76 and 30.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.63 : 58.76 = 30.31 : x
2. Step 2: Convert to fraction form
   42.63/58.76 = 30.31/x
3. Step 3: Cross multiply
   42.63x = 58.76 × 30.31
4. Step 4: Simplify right side
   42.63x = 1,780.83
5. Step 5: Solve for x
   x = 1,780.83/42.63
6. Step 6: Final answer
   x = 41.78