Finding the Fourth Proportional to 42.21, 63.45 and 33.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42.21 : 63.45 = 33.30 : x
2. Step 2: Convert to fraction form
   42.21/63.45 = 33.30/x
3. Step 3: Cross multiply
   42.21x = 63.45 × 33.30
4. Step 4: Simplify right side
   42.21x = 2,112.89
5. Step 5: Solve for x
   x = 2,112.89/42.21
6. Step 6: Final answer
   x = 50.06