Finding the Fourth Proportional to 2,665.02, 3,993.88 and 1,689.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.02 : 3,993.88 = 1,689.37 : x
2. Step 2: Convert to fraction form
   2,665.02/3,993.88 = 1,689.37/x
3. Step 3: Cross multiply
   2,665.02x = 3,993.88 × 1,689.37
4. Step 4: Simplify right side
   2,665.02x = 6,747,141.06
5. Step 5: Solve for x
   x = 6,747,141.06/2,665.02
6. Step 6: Final answer
   x = 2,531.74