Finding the Fourth Proportional to 2,574.16, 3,859.78 and 818.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,574.16 : 3,859.78 = 818.82 : x
2. Step 2: Convert to fraction form
   2,574.16/3,859.78 = 818.82/x
3. Step 3: Cross multiply
   2,574.16x = 3,859.78 × 818.82
4. Step 4: Simplify right side
   2,574.16x = 3,160,465.06
5. Step 5: Solve for x
   x = 3,160,465.06/2,574.16
6. Step 6: Final answer
   x = 1,227.77