Finding the Fourth Proportional to 2,763.09, 4,145.31 and 815.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,763.09 : 4,145.31 = 815.27 : x
2. Step 2: Convert to fraction form
   2,763.09/4,145.31 = 815.27/x
3. Step 3: Cross multiply
   2,763.09x = 4,145.31 × 815.27
4. Step 4: Simplify right side
   2,763.09x = 3,379,546.88
5. Step 5: Solve for x
   x = 3,379,546.88/2,763.09
6. Step 6: Final answer
   x = 1,223.10