Finding the Fourth Proportional to 1,556.72, 2,148.20 and 858.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,556.72 : 2,148.20 = 858.04 : x
2. Step 2: Convert to fraction form
   1,556.72/2,148.20 = 858.04/x
3. Step 3: Cross multiply
   1,556.72x = 2,148.20 × 858.04
4. Step 4: Simplify right side
   1,556.72x = 1,843,241.53
5. Step 5: Solve for x
   x = 1,843,241.53/1,556.72
6. Step 6: Final answer
   x = 1,184.05