Finding the Fourth Proportional to 72.22, 99.68 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   72.22 : 99.68 = 42.71 : x
2. Step 2: Convert to fraction form
   72.22/99.68 = 42.71/x
3. Step 3: Cross multiply
   72.22x = 99.68 × 42.71
4. Step 4: Simplify right side
   72.22x = 4,257.33
5. Step 5: Solve for x
   x = 4,257.33/72.22
6. Step 6: Final answer
   x = 58.95