Finding the Fourth Proportional to 42.45, 63.69 and 22.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42.45 : 63.69 = 22.15 : x
2. Step 2: Convert to fraction form
   42.45/63.69 = 22.15/x
3. Step 3: Cross multiply
   42.45x = 63.69 × 22.15
4. Step 4: Simplify right side
   42.45x = 1,410.55
5. Step 5: Solve for x
   x = 1,410.55/42.45
6. Step 6: Final answer
   x = 33.23