Finding the Fourth Proportional to 1,556.34, 2,147.72 and 857.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.34 : 2,147.72 = 857.67 : x
2. Step 2: Convert to fraction form
   1,556.34/2,147.72 = 857.67/x
3. Step 3: Cross multiply
   1,556.34x = 2,147.72 × 857.67
4. Step 4: Simplify right side
   1,556.34x = 1,842,035.01
5. Step 5: Solve for x
   x = 1,842,035.01/1,556.34
6. Step 6: Final answer
   x = 1,183.57