Finding the Fourth Proportional to 72.41, 99.83 and 57.68

Step by Step Solution

1. Step 1: Write the proportion equation
   72.41 : 99.83 = 57.68 : x
2. Step 2: Convert to fraction form
   72.41/99.83 = 57.68/x
3. Step 3: Cross multiply
   72.41x = 99.83 × 57.68
4. Step 4: Simplify right side
   72.41x = 5,758.21
5. Step 5: Solve for x
   x = 5,758.21/72.41
6. Step 6: Final answer
   x = 79.52