Finding the Fourth Proportional to 1,859.82, 2,789.74 and 1,391.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,859.82 : 2,789.74 = 1,391.78 : x
2. Step 2: Convert to fraction form
   1,859.82/2,789.74 = 1,391.78/x
3. Step 3: Cross multiply
   1,859.82x = 2,789.74 × 1,391.78
4. Step 4: Simplify right side
   1,859.82x = 3,882,705.22
5. Step 5: Solve for x
   x = 3,882,705.22/1,859.82
6. Step 6: Final answer
   x = 2,087.68