Finding the Fourth Proportional to 3,185.39, 4,777.57 and 845.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,185.39 : 4,777.57 = 845.55 : x
2. Step 2: Convert to fraction form
   3,185.39/4,777.57 = 845.55/x
3. Step 3: Cross multiply
   3,185.39x = 4,777.57 × 845.55
4. Step 4: Simplify right side
   3,185.39x = 4,039,674.31
5. Step 5: Solve for x
   x = 4,039,674.31/3,185.39
6. Step 6: Final answer
   x = 1,268.19