Finding the Fourth Proportional to 2,081.30, 3,121.05 and 848.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.30 : 3,121.05 = 848.30 : x
2. Step 2: Convert to fraction form
   2,081.30/3,121.05 = 848.30/x
3. Step 3: Cross multiply
   2,081.30x = 3,121.05 × 848.30
4. Step 4: Simplify right side
   2,081.30x = 2,647,586.72
5. Step 5: Solve for x
   x = 2,647,586.72/2,081.30
6. Step 6: Final answer
   x = 1,272.08