Finding the Fourth Proportional to 1,556.45, 2,147.89 and 857.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.45 : 2,147.89 = 857.82 : x
2. Step 2: Convert to fraction form
   1,556.45/2,147.89 = 857.82/x
3. Step 3: Cross multiply
   1,556.45x = 2,147.89 × 857.82
4. Step 4: Simplify right side
   1,556.45x = 1,842,503.00
5. Step 5: Solve for x
   x = 1,842,503.00/1,556.45
6. Step 6: Final answer
   x = 1,183.79