Finding the Fourth Proportional to 72.39, 108.59 and 64.82

Step by Step Solution

1. Step 1: Write the proportion equation
   72.39 : 108.59 = 64.82 : x
2. Step 2: Convert to fraction form
   72.39/108.59 = 64.82/x
3. Step 3: Cross multiply
   72.39x = 108.59 × 64.82
4. Step 4: Simplify right side
   72.39x = 7,038.80
5. Step 5: Solve for x
   x = 7,038.80/72.39
6. Step 6: Final answer
   x = 97.23