Finding the Fourth Proportional to 72.06, 107.82 and 53.94

Step by Step Solution

1. Step 1: Write the proportion equation
   72.06 : 107.82 = 53.94 : x
2. Step 2: Convert to fraction form
   72.06/107.82 = 53.94/x
3. Step 3: Cross multiply
   72.06x = 107.82 × 53.94
4. Step 4: Simplify right side
   72.06x = 5,815.81
5. Step 5: Solve for x
   x = 5,815.81/72.06
6. Step 6: Final answer
   x = 80.71