Finding the Fourth Proportional to 2,895.86, 4,344.06 and 815.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,895.86 : 4,344.06 = 815.78 : x
2. Step 2: Convert to fraction form
   2,895.86/4,344.06 = 815.78/x
3. Step 3: Cross multiply
   2,895.86x = 4,344.06 × 815.78
4. Step 4: Simplify right side
   2,895.86x = 3,543,797.27
5. Step 5: Solve for x
   x = 3,543,797.27/2,895.86
6. Step 6: Final answer
   x = 1,223.75