Finding the Fourth Proportional to 2,485.68, 3,727.60 and 819.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,485.68 : 3,727.60 = 819.38 : x
2. Step 2: Convert to fraction form
   2,485.68/3,727.60 = 819.38/x
3. Step 3: Cross multiply
   2,485.68x = 3,727.60 × 819.38
4. Step 4: Simplify right side
   2,485.68x = 3,054,320.89
5. Step 5: Solve for x
   x = 3,054,320.89/2,485.68
6. Step 6: Final answer
   x = 1,228.77