Finding the Fourth Proportional to 2,081.40, 3,118.05 and 1,257.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.40 : 3,118.05 = 1,257.23 : x
2. Step 2: Convert to fraction form
   2,081.40/3,118.05 = 1,257.23/x
3. Step 3: Cross multiply
   2,081.40x = 3,118.05 × 1,257.23
4. Step 4: Simplify right side
   2,081.40x = 3,920,106.00
5. Step 5: Solve for x
   x = 3,920,106.00/2,081.40
6. Step 6: Final answer
   x = 1,883.40