Finding the Fourth Proportional to 2,563.34, 3,845.68 and 808.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,563.34 : 3,845.68 = 808.40 : x
2. Step 2: Convert to fraction form
   2,563.34/3,845.68 = 808.40/x
3. Step 3: Cross multiply
   2,563.34x = 3,845.68 × 808.40
4. Step 4: Simplify right side
   2,563.34x = 3,108,855.31
5. Step 5: Solve for x
   x = 3,108,855.31/2,563.34
6. Step 6: Final answer
   x = 1,212.82