Finding the Fourth Proportional to 2,548.72, 3,823.20 and 817.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,548.72 : 3,823.20 = 817.36 : x
2. Step 2: Convert to fraction form
   2,548.72/3,823.20 = 817.36/x
3. Step 3: Cross multiply
   2,548.72x = 3,823.20 × 817.36
4. Step 4: Simplify right side
   2,548.72x = 3,124,930.75
5. Step 5: Solve for x
   x = 3,124,930.75/2,548.72
6. Step 6: Final answer
   x = 1,226.08