Finding the Fourth Proportional to 72.58, 108.83 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   72.58 : 108.83 = 42.15 : x
2. Step 2: Convert to fraction form
   72.58/108.83 = 42.15/x
3. Step 3: Cross multiply
   72.58x = 108.83 × 42.15
4. Step 4: Simplify right side
   72.58x = 4,587.32
5. Step 5: Solve for x
   x = 4,587.32/72.58
6. Step 6: Final answer
   x = 63.21