Finding the Fourth Proportional to 2,689.17, 4,031.72 and 1,389.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,689.17 : 4,031.72 = 1,389.81 : x
2. Step 2: Convert to fraction form
   2,689.17/4,031.72 = 1,389.81/x
3. Step 3: Cross multiply
   2,689.17x = 4,031.72 × 1,389.81
4. Step 4: Simplify right side
   2,689.17x = 5,603,317.82
5. Step 5: Solve for x
   x = 5,603,317.82/2,689.17
6. Step 6: Final answer
   x = 2,083.66