Finding the Fourth Proportional to 72.80, 108.98 and 53.24

Step by Step Solution

1. Step 1: Write the proportion equation
   72.80 : 108.98 = 53.24 : x
2. Step 2: Convert to fraction form
   72.80/108.98 = 53.24/x
3. Step 3: Cross multiply
   72.80x = 108.98 × 53.24
4. Step 4: Simplify right side
   72.80x = 5,801.69
5. Step 5: Solve for x
   x = 5,801.69/72.80
6. Step 6: Final answer
   x = 79.69