Finding the Fourth Proportional to 71.69, 107.43 and 53.60

Step by Step Solution

1. Step 1: Write the proportion equation
   71.69 : 107.43 = 53.60 : x
2. Step 2: Convert to fraction form
   71.69/107.43 = 53.60/x
3. Step 3: Cross multiply
   71.69x = 107.43 × 53.60
4. Step 4: Simplify right side
   71.69x = 5,757.51
5. Step 5: Solve for x
   x = 5,757.51/71.69
6. Step 6: Final answer
   x = 80.32