Finding the Fourth Proportional to 71.75, 107.56 and 55.69

Step by Step Solution

1. Step 1: Write the proportion equation
   71.75 : 107.56 = 55.69 : x
2. Step 2: Convert to fraction form
   71.75/107.56 = 55.69/x
3. Step 3: Cross multiply
   71.75x = 107.56 × 55.69
4. Step 4: Simplify right side
   71.75x = 5,989.82
5. Step 5: Solve for x
   x = 5,989.82/71.75
6. Step 6: Final answer
   x = 83.48