Finding the Fourth Proportional to 71.33, 106.85 and 53.37

Step by Step Solution

1. Step 1: Write the proportion equation
   71.33 : 106.85 = 53.37 : x
2. Step 2: Convert to fraction form
   71.33/106.85 = 53.37/x
3. Step 3: Cross multiply
   71.33x = 106.85 × 53.37
4. Step 4: Simplify right side
   71.33x = 5,702.72
5. Step 5: Solve for x
   x = 5,702.72/71.33
6. Step 6: Final answer
   x = 79.95