Finding the Fourth Proportional to 1,556.72, 2,148.42 and 858.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.72 : 2,148.42 = 858.09 : x
2. Step 2: Convert to fraction form
   1,556.72/2,148.42 = 858.09/x
3. Step 3: Cross multiply
   1,556.72x = 2,148.42 × 858.09
4. Step 4: Simplify right side
   1,556.72x = 1,843,548.99
5. Step 5: Solve for x
   x = 1,843,548.99/1,556.72
6. Step 6: Final answer
   x = 1,184.25