Finding the Fourth Proportional to 71.61, 107.49 and 50.25

Step by Step Solution

1. Step 1: Write the proportion equation
   71.61 : 107.49 = 50.25 : x
2. Step 2: Convert to fraction form
   71.61/107.49 = 50.25/x
3. Step 3: Cross multiply
   71.61x = 107.49 × 50.25
4. Step 4: Simplify right side
   71.61x = 5,401.37
5. Step 5: Solve for x
   x = 5,401.37/71.61
6. Step 6: Final answer
   x = 75.43