Finding the Fourth Proportional to 1,707.69, 2,559.15 and 1,290.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.69 : 2,559.15 = 1,290.88 : x
2. Step 2: Convert to fraction form
   1,707.69/2,559.15 = 1,290.88/x
3. Step 3: Cross multiply
   1,707.69x = 2,559.15 × 1,290.88
4. Step 4: Simplify right side
   1,707.69x = 3,303,542.76
5. Step 5: Solve for x
   x = 3,303,542.76/1,707.69
6. Step 6: Final answer
   x = 1,934.51