Finding the Fourth Proportional to 72.56, 100.15 and 53.19

Step by Step Solution

1. Step 1: Write the proportion equation
   72.56 : 100.15 = 53.19 : x
2. Step 2: Convert to fraction form
   72.56/100.15 = 53.19/x
3. Step 3: Cross multiply
   72.56x = 100.15 × 53.19
4. Step 4: Simplify right side
   72.56x = 5,326.85
5. Step 5: Solve for x
   x = 5,326.85/72.56
6. Step 6: Final answer
   x = 73.41