Finding the Fourth Proportional to 71.37, 106.79 and 53.19

Step by Step Solution

1. Step 1: Write the proportion equation
   71.37 : 106.79 = 53.19 : x
2. Step 2: Convert to fraction form
   71.37/106.79 = 53.19/x
3. Step 3: Cross multiply
   71.37x = 106.79 × 53.19
4. Step 4: Simplify right side
   71.37x = 5,679.89
5. Step 5: Solve for x
   x = 5,679.89/71.37
6. Step 6: Final answer
   x = 79.58