Finding the Fourth Proportional to 72.96, 100.56 and 53.64

Step by Step Solution

1. Step 1: Write the proportion equation
   72.96 : 100.56 = 53.64 : x
2. Step 2: Convert to fraction form
   72.96/100.56 = 53.64/x
3. Step 3: Cross multiply
   72.96x = 100.56 × 53.64
4. Step 4: Simplify right side
   72.96x = 5,394.04
5. Step 5: Solve for x
   x = 5,394.04/72.96
6. Step 6: Final answer
   x = 73.93