Finding the Fourth Proportional to 2,276.49, 3,414.72 and 815.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,276.49 : 3,414.72 = 815.31 : x
2. Step 2: Convert to fraction form
   2,276.49/3,414.72 = 815.31/x
3. Step 3: Cross multiply
   2,276.49x = 3,414.72 × 815.31
4. Step 4: Simplify right side
   2,276.49x = 2,784,055.36
5. Step 5: Solve for x
   x = 2,784,055.36/2,276.49
6. Step 6: Final answer
   x = 1,222.96