Finding the Fourth Proportional to 1,390.75, 2,081.97 and 841.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,390.75 : 2,081.97 = 841.27 : x
2. Step 2: Convert to fraction form
   1,390.75/2,081.97 = 841.27/x
3. Step 3: Cross multiply
   1,390.75x = 2,081.97 × 841.27
4. Step 4: Simplify right side
   1,390.75x = 1,751,498.90
5. Step 5: Solve for x
   x = 1,751,498.90/1,390.75
6. Step 6: Final answer
   x = 1,259.39