Finding the Fourth Proportional to 71.33, 106.98 and 53.30

Step by Step Solution

1. Step 1: Write the proportion equation
   71.33 : 106.98 = 53.30 : x
2. Step 2: Convert to fraction form
   71.33/106.98 = 53.30/x
3. Step 3: Cross multiply
   71.33x = 106.98 × 53.30
4. Step 4: Simplify right side
   71.33x = 5,702.30
5. Step 5: Solve for x
   x = 5,702.30/71.33
6. Step 6: Final answer
   x = 79.95