Finding the Fourth Proportional to 1,719.53, 2,578.06 and 1,390.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,719.53 : 2,578.06 = 1,390.87 : x
2. Step 2: Convert to fraction form
   1,719.53/2,578.06 = 1,390.87/x
3. Step 3: Cross multiply
   1,719.53x = 2,578.06 × 1,390.87
4. Step 4: Simplify right side
   1,719.53x = 3,585,751.27
5. Step 5: Solve for x
   x = 3,585,751.27/1,719.53
6. Step 6: Final answer
   x = 2,085.31