Finding the Fourth Proportional to 72.37, 99.82 and 55.97

Step by Step Solution

1. Step 1: Write the proportion equation
   72.37 : 99.82 = 55.97 : x
2. Step 2: Convert to fraction form
   72.37/99.82 = 55.97/x
3. Step 3: Cross multiply
   72.37x = 99.82 × 55.97
4. Step 4: Simplify right side
   72.37x = 5,586.93
5. Step 5: Solve for x
   x = 5,586.93/72.37
6. Step 6: Final answer
   x = 77.20