Finding the Fourth Proportional to 1,556.41, 2,147.83 and 857.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.41 : 2,147.83 = 857.78 : x
2. Step 2: Convert to fraction form
   1,556.41/2,147.83 = 857.78/x
3. Step 3: Cross multiply
   1,556.41x = 2,147.83 × 857.78
4. Step 4: Simplify right side
   1,556.41x = 1,842,365.62
5. Step 5: Solve for x
   x = 1,842,365.62/1,556.41
6. Step 6: Final answer
   x = 1,183.73