Finding the Fourth Proportional to 72.39, 108.54 and 42.01

Step by Step Solution

1. Step 1: Write the proportion equation
   72.39 : 108.54 = 42.01 : x
2. Step 2: Convert to fraction form
   72.39/108.54 = 42.01/x
3. Step 3: Cross multiply
   72.39x = 108.54 × 42.01
4. Step 4: Simplify right side
   72.39x = 4,559.80
5. Step 5: Solve for x
   x = 4,559.80/72.39
6. Step 6: Final answer
   x = 62.99