Finding the Fourth Proportional to 1,853.98, 2,556.39 and 1,387.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,853.98 : 2,556.39 = 1,387.42 : x
2. Step 2: Convert to fraction form
   1,853.98/2,556.39 = 1,387.42/x
3. Step 3: Cross multiply
   1,853.98x = 2,556.39 × 1,387.42
4. Step 4: Simplify right side
   1,853.98x = 3,546,786.61
5. Step 5: Solve for x
   x = 3,546,786.61/1,853.98
6. Step 6: Final answer
   x = 1,913.07