Finding the Fourth Proportional to 1,556.01, 2,147.31 and 857.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.01 : 2,147.31 = 857.39 : x
2. Step 2: Convert to fraction form
   1,556.01/2,147.31 = 857.39/x
3. Step 3: Cross multiply
   1,556.01x = 2,147.31 × 857.39
4. Step 4: Simplify right side
   1,556.01x = 1,841,071.38
5. Step 5: Solve for x
   x = 1,841,071.38/1,556.01
6. Step 6: Final answer
   x = 1,183.20