Finding the Fourth Proportional to 72.54, 108.66 and 42.12

Step by Step Solution

1. Step 1: Write the proportion equation
   72.54 : 108.66 = 42.12 : x
2. Step 2: Convert to fraction form
   72.54/108.66 = 42.12/x
3. Step 3: Cross multiply
   72.54x = 108.66 × 42.12
4. Step 4: Simplify right side
   72.54x = 4,576.76
5. Step 5: Solve for x
   x = 4,576.76/72.54
6. Step 6: Final answer
   x = 63.09