Finding the Fourth Proportional to 72.88, 109.24 and 52.56

Step by Step Solution

1. Step 1: Write the proportion equation
   72.88 : 109.24 = 52.56 : x
2. Step 2: Convert to fraction form
   72.88/109.24 = 52.56/x
3. Step 3: Cross multiply
   72.88x = 109.24 × 52.56
4. Step 4: Simplify right side
   72.88x = 5,741.65
5. Step 5: Solve for x
   x = 5,741.65/72.88
6. Step 6: Final answer
   x = 78.78