Finding the Fourth Proportional to 72.84, 100.47 and 57.27

Step by Step Solution

1. Step 1: Write the proportion equation
   72.84 : 100.47 = 57.27 : x
2. Step 2: Convert to fraction form
   72.84/100.47 = 57.27/x
3. Step 3: Cross multiply
   72.84x = 100.47 × 57.27
4. Step 4: Simplify right side
   72.84x = 5,753.92
5. Step 5: Solve for x
   x = 5,753.92/72.84
6. Step 6: Final answer
   x = 78.99