Finding the Fourth Proportional to 2,209.43, 3,311.82 and 1,688.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,209.43 : 3,311.82 = 1,688.30 : x
2. Step 2: Convert to fraction form
   2,209.43/3,311.82 = 1,688.30/x
3. Step 3: Cross multiply
   2,209.43x = 3,311.82 × 1,688.30
4. Step 4: Simplify right side
   2,209.43x = 5,591,345.71
5. Step 5: Solve for x
   x = 5,591,345.71/2,209.43
6. Step 6: Final answer
   x = 2,530.67