Finding the Fourth Proportional to 1,718.54, 2,572.69 and 1,689.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,718.54 : 2,572.69 = 1,689.15 : x
2. Step 2: Convert to fraction form
   1,718.54/2,572.69 = 1,689.15/x
3. Step 3: Cross multiply
   1,718.54x = 2,572.69 × 1,689.15
4. Step 4: Simplify right side
   1,718.54x = 4,345,663.15
5. Step 5: Solve for x
   x = 4,345,663.15/1,718.54
6. Step 6: Final answer
   x = 2,528.69