Finding the Fourth Proportional to 2,018.88, 2,789.28 and 1,686.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,018.88 : 2,789.28 = 1,686.24 : x
2. Step 2: Convert to fraction form
   2,018.88/2,789.28 = 1,686.24/x
3. Step 3: Cross multiply
   2,018.88x = 2,789.28 × 1,686.24
4. Step 4: Simplify right side
   2,018.88x = 4,703,395.51
5. Step 5: Solve for x
   x = 4,703,395.51/2,018.88
6. Step 6: Final answer
   x = 2,329.71