Finding the Fourth Proportional to 42.79, 64.25 and 33.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42.79 : 64.25 = 33.17 : x
2. Step 2: Convert to fraction form
   42.79/64.25 = 33.17/x
3. Step 3: Cross multiply
   42.79x = 64.25 × 33.17
4. Step 4: Simplify right side
   42.79x = 2,130.69
5. Step 5: Solve for x
   x = 2,130.69/42.79
6. Step 6: Final answer
   x = 49.79