Finding the Fourth Proportional to 72.86, 108.90 and 53.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72.86 : 108.90 = 53.48 : x
2. Step 2: Convert to fraction form
   72.86/108.90 = 53.48/x
3. Step 3: Cross multiply
   72.86x = 108.90 × 53.48
4. Step 4: Simplify right side
   72.86x = 5,824.24
5. Step 5: Solve for x
   x = 5,824.24/72.86
6. Step 6: Final answer
   x = 79.94