Finding the Fourth Proportional to 71.83, 107.60 and 53.81

Step by Step Solution

1. Step 1: Write the proportion equation
   71.83 : 107.60 = 53.81 : x
2. Step 2: Convert to fraction form
   71.83/107.60 = 53.81/x
3. Step 3: Cross multiply
   71.83x = 107.60 × 53.81
4. Step 4: Simplify right side
   71.83x = 5,789.69
5. Step 5: Solve for x
   x = 5,789.69/71.83
6. Step 6: Final answer
   x = 80.61