Finding the Fourth Proportional to 2,081.30, 3,121.83 and 1,259.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.30 : 3,121.83 = 1,259.35 : x
2. Step 2: Convert to fraction form
   2,081.30/3,121.83 = 1,259.35/x
3. Step 3: Cross multiply
   2,081.30x = 3,121.83 × 1,259.35
4. Step 4: Simplify right side
   2,081.30x = 3,931,476.61
5. Step 5: Solve for x
   x = 3,931,476.61/2,081.30
6. Step 6: Final answer
   x = 1,888.95