Finding the Fourth Proportional to 2,561.04, 3,840.49 and 805.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.04 : 3,840.49 = 805.45 : x
2. Step 2: Convert to fraction form
   2,561.04/3,840.49 = 805.45/x
3. Step 3: Cross multiply
   2,561.04x = 3,840.49 × 805.45
4. Step 4: Simplify right side
   2,561.04x = 3,093,322.67
5. Step 5: Solve for x
   x = 3,093,322.67/2,561.04
6. Step 6: Final answer
   x = 1,207.84