Finding the Fourth Proportional to 72.65, 109.01 and 54.72

Step by Step Solution

1. Step 1: Write the proportion equation
   72.65 : 109.01 = 54.72 : x
2. Step 2: Convert to fraction form
   72.65/109.01 = 54.72/x
3. Step 3: Cross multiply
   72.65x = 109.01 × 54.72
4. Step 4: Simplify right side
   72.65x = 5,964.75
5. Step 5: Solve for x
   x = 5,964.75/72.65
6. Step 6: Final answer
   x = 82.11