Finding the Fourth Proportional to 1,726.24, 2,585.76 and 1,288.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,726.24 : 2,585.76 = 1,288.12 : x
2. Step 2: Convert to fraction form
   1,726.24/2,585.76 = 1,288.12/x
3. Step 3: Cross multiply
   1,726.24x = 2,585.76 × 1,288.12
4. Step 4: Simplify right side
   1,726.24x = 3,330,769.17
5. Step 5: Solve for x
   x = 3,330,769.17/1,726.24
6. Step 6: Final answer
   x = 1,929.49