Finding the Fourth Proportional to 71.52, 107.33 and 53.61

Step by Step Solution

1. Step 1: Write the proportion equation
   71.52 : 107.33 = 53.61 : x
2. Step 2: Convert to fraction form
   71.52/107.33 = 53.61/x
3. Step 3: Cross multiply
   71.52x = 107.33 × 53.61
4. Step 4: Simplify right side
   71.52x = 5,753.69
5. Step 5: Solve for x
   x = 5,753.69/71.52
6. Step 6: Final answer
   x = 80.45