Finding the Fourth Proportional to 72.37, 99.81 and 55.96

Step by Step Solution

1. Step 1: Write the proportion equation
   72.37 : 99.81 = 55.96 : x
2. Step 2: Convert to fraction form
   72.37/99.81 = 55.96/x
3. Step 3: Cross multiply
   72.37x = 99.81 × 55.96
4. Step 4: Simplify right side
   72.37x = 5,585.37
5. Step 5: Solve for x
   x = 5,585.37/72.37
6. Step 6: Final answer
   x = 77.18