Finding the Fourth Proportional to 2,763.06, 4,144.71 and 815.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,763.06 : 4,144.71 = 815.28 : x
2. Step 2: Convert to fraction form
   2,763.06/4,144.71 = 815.28/x
3. Step 3: Cross multiply
   2,763.06x = 4,144.71 × 815.28
4. Step 4: Simplify right side
   2,763.06x = 3,379,099.17
5. Step 5: Solve for x
   x = 3,379,099.17/2,763.06
6. Step 6: Final answer
   x = 1,222.96