Finding the Fourth Proportional to 2,078.99, 2,869.59 and 1,239.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.99 : 2,869.59 = 1,239.42 : x
2. Step 2: Convert to fraction form
   2,078.99/2,869.59 = 1,239.42/x
3. Step 3: Cross multiply
   2,078.99x = 2,869.59 × 1,239.42
4. Step 4: Simplify right side
   2,078.99x = 3,556,627.24
5. Step 5: Solve for x
   x = 3,556,627.24/2,078.99
6. Step 6: Final answer
   x = 1,710.75