Finding the Fourth Proportional to 2,287.10, 3,155.95 and 1,689.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.10 : 3,155.95 = 1,689.91 : x
2. Step 2: Convert to fraction form
   2,287.10/3,155.95 = 1,689.91/x
3. Step 3: Cross multiply
   2,287.10x = 3,155.95 × 1,689.91
4. Step 4: Simplify right side
   2,287.10x = 5,333,271.46
5. Step 5: Solve for x
   x = 5,333,271.46/2,287.10
6. Step 6: Final answer
   x = 2,331.89