Finding the Fourth Proportional to 72.96, 100.68 and 55.48

Step by Step Solution

1. Step 1: Write the proportion equation
   72.96 : 100.68 = 55.48 : x
2. Step 2: Convert to fraction form
   72.96/100.68 = 55.48/x
3. Step 3: Cross multiply
   72.96x = 100.68 × 55.48
4. Step 4: Simplify right side
   72.96x = 5,585.73
5. Step 5: Solve for x
   x = 5,585.73/72.96
6. Step 6: Final answer
   x = 76.56