Finding the Fourth Proportional to 42.76, 64.37 and 30.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42.76 : 64.37 = 30.82 : x
2. Step 2: Convert to fraction form
   42.76/64.37 = 30.82/x
3. Step 3: Cross multiply
   42.76x = 64.37 × 30.82
4. Step 4: Simplify right side
   42.76x = 1,983.88
5. Step 5: Solve for x
   x = 1,983.88/42.76
6. Step 6: Final answer
   x = 46.40