Finding the Fourth Proportional to 2,085.98, 3,128.94 and 1,719.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.98 : 3,128.94 = 1,719.30 : x
2. Step 2: Convert to fraction form
   2,085.98/3,128.94 = 1,719.30/x
3. Step 3: Cross multiply
   2,085.98x = 3,128.94 × 1,719.30
4. Step 4: Simplify right side
   2,085.98x = 5,379,586.54
5. Step 5: Solve for x
   x = 5,379,586.54/2,085.98
6. Step 6: Final answer
   x = 2,578.93