Finding the Fourth Proportional to 1,718.52, 2,581.34 and 1,389.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,718.52 : 2,581.34 = 1,389.82 : x
2. Step 2: Convert to fraction form
   1,718.52/2,581.34 = 1,389.82/x
3. Step 3: Cross multiply
   1,718.52x = 2,581.34 × 1,389.82
4. Step 4: Simplify right side
   1,718.52x = 3,587,597.96
5. Step 5: Solve for x
   x = 3,587,597.96/1,718.52
6. Step 6: Final answer
   x = 2,087.61