Finding the Fourth Proportional to 72.09, 107.33 and 71.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72.09 : 107.33 = 71.69 : x
2. Step 2: Convert to fraction form
   72.09/107.33 = 71.69/x
3. Step 3: Cross multiply
   72.09x = 107.33 × 71.69
4. Step 4: Simplify right side
   72.09x = 7,693.59
5. Step 5: Solve for x
   x = 7,693.59/72.09
6. Step 6: Final answer
   x = 106.72