Finding the Fourth Proportional to 1,726.74, 2,586.51 and 1,288.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,726.74 : 2,586.51 = 1,288.62 : x
2. Step 2: Convert to fraction form
   1,726.74/2,586.51 = 1,288.62/x
3. Step 3: Cross multiply
   1,726.74x = 2,586.51 × 1,288.62
4. Step 4: Simplify right side
   1,726.74x = 3,333,028.52
5. Step 5: Solve for x
   x = 3,333,028.52/1,726.74
6. Step 6: Final answer
   x = 1,930.24