Finding the Fourth Proportional to 42.83, 64.18 and 33.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.83 : 64.18 = 33.18 : x
2. Step 2: Convert to fraction form
   42.83/64.18 = 33.18/x
3. Step 3: Cross multiply
   42.83x = 64.18 × 33.18
4. Step 4: Simplify right side
   42.83x = 2,129.49
5. Step 5: Solve for x
   x = 2,129.49/42.83
6. Step 6: Final answer
   x = 49.72