Finding the Fourth Proportional to 72.02, 107.82 and 53.93

Step by Step Solution

1. Step 1: Write the proportion equation
   72.02 : 107.82 = 53.93 : x
2. Step 2: Convert to fraction form
   72.02/107.82 = 53.93/x
3. Step 3: Cross multiply
   72.02x = 107.82 × 53.93
4. Step 4: Simplify right side
   72.02x = 5,814.73
5. Step 5: Solve for x
   x = 5,814.73/72.02
6. Step 6: Final answer
   x = 80.74