Finding the Fourth Proportional to 42.33, 63.45 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42.33 : 63.45 = 42.15 : x
2. Step 2: Convert to fraction form
   42.33/63.45 = 42.15/x
3. Step 3: Cross multiply
   42.33x = 63.45 × 42.15
4. Step 4: Simplify right side
   42.33x = 2,674.42
5. Step 5: Solve for x
   x = 2,674.42/42.33
6. Step 6: Final answer
   x = 63.18