Finding the Fourth Proportional to 2,685.48, 3,707.69 and 2,189.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,685.48 : 3,707.69 = 2,189.31 : x
2. Step 2: Convert to fraction form
   2,685.48/3,707.69 = 2,189.31/x
3. Step 3: Cross multiply
   2,685.48x = 3,707.69 × 2,189.31
4. Step 4: Simplify right side
   2,685.48x = 8,117,271.85
5. Step 5: Solve for x
   x = 8,117,271.85/2,685.48
6. Step 6: Final answer
   x = 3,022.65