Finding the Fourth Proportional to 2,551.36, 3,824.56 and 818.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,551.36 : 3,824.56 = 818.80 : x
2. Step 2: Convert to fraction form
   2,551.36/3,824.56 = 818.80/x
3. Step 3: Cross multiply
   2,551.36x = 3,824.56 × 818.80
4. Step 4: Simplify right side
   2,551.36x = 3,131,549.73
5. Step 5: Solve for x
   x = 3,131,549.73/2,551.36
6. Step 6: Final answer
   x = 1,227.40