Finding the Fourth Proportional to 72.66, 108.88 and 42.14

Step by Step Solution

1. Step 1: Write the proportion equation
   72.66 : 108.88 = 42.14 : x
2. Step 2: Convert to fraction form
   72.66/108.88 = 42.14/x
3. Step 3: Cross multiply
   72.66x = 108.88 × 42.14
4. Step 4: Simplify right side
   72.66x = 4,588.20
5. Step 5: Solve for x
   x = 4,588.20/72.66
6. Step 6: Final answer
   x = 63.15