Finding the Fourth Proportional to 72.59, 108.38 and 72.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72.59 : 108.38 = 72.09 : x
2. Step 2: Convert to fraction form
   72.59/108.38 = 72.09/x
3. Step 3: Cross multiply
   72.59x = 108.38 × 72.09
4. Step 4: Simplify right side
   72.59x = 7,813.29
5. Step 5: Solve for x
   x = 7,813.29/72.59
6. Step 6: Final answer
   x = 107.64