Finding the Fourth Proportional to 72.61, 108.76 and 53.39

Step by Step Solution

1. Step 1: Write the proportion equation
   72.61 : 108.76 = 53.39 : x
2. Step 2: Convert to fraction form
   72.61/108.76 = 53.39/x
3. Step 3: Cross multiply
   72.61x = 108.76 × 53.39
4. Step 4: Simplify right side
   72.61x = 5,806.02
5. Step 5: Solve for x
   x = 5,806.02/72.61
6. Step 6: Final answer
   x = 79.96