Finding the Fourth Proportional to 2,813.50, 3,878.30 and 2,315.26

Step by Step Solution

1. Step 1: Write the proportion equation
   2,813.50 : 3,878.30 = 2,315.26 : x
2. Step 2: Convert to fraction form
   2,813.50/3,878.30 = 2,315.26/x
3. Step 3: Cross multiply
   2,813.50x = 3,878.30 × 2,315.26
4. Step 4: Simplify right side
   2,813.50x = 8,979,241.89
5. Step 5: Solve for x
   x = 8,979,241.89/2,813.50
6. Step 6: Final answer
   x = 3,191.49