Finding the Fourth Proportional to 2,688.26, 4,032.59 and 1,389.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.26 : 4,032.59 = 1,389.96 : x
2. Step 2: Convert to fraction form
   2,688.26/4,032.59 = 1,389.96/x
3. Step 3: Cross multiply
   2,688.26x = 4,032.59 × 1,389.96
4. Step 4: Simplify right side
   2,688.26x = 5,605,131.85
5. Step 5: Solve for x
   x = 5,605,131.85/2,688.26
6. Step 6: Final answer
   x = 2,085.04