Finding the Fourth Proportional to 71.37, 106.83 and 53.94

Step by Step Solution

1. Step 1: Write the proportion equation
   71.37 : 106.83 = 53.94 : x
2. Step 2: Convert to fraction form
   71.37/106.83 = 53.94/x
3. Step 3: Cross multiply
   71.37x = 106.83 × 53.94
4. Step 4: Simplify right side
   71.37x = 5,762.41
5. Step 5: Solve for x
   x = 5,762.41/71.37
6. Step 6: Final answer
   x = 80.74