Finding the Fourth Proportional to 71.26, 106.82 and 53.18

Step by Step Solution

1. Step 1: Write the proportion equation
   71.26 : 106.82 = 53.18 : x
2. Step 2: Convert to fraction form
   71.26/106.82 = 53.18/x
3. Step 3: Cross multiply
   71.26x = 106.82 × 53.18
4. Step 4: Simplify right side
   71.26x = 5,680.69
5. Step 5: Solve for x
   x = 5,680.69/71.26
6. Step 6: Final answer
   x = 79.72