Finding the Fourth Proportional to 2,189.46, 3,284.38 and 688.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.46 : 3,284.38 = 688.38 : x
2. Step 2: Convert to fraction form
   2,189.46/3,284.38 = 688.38/x
3. Step 3: Cross multiply
   2,189.46x = 3,284.38 × 688.38
4. Step 4: Simplify right side
   2,189.46x = 2,260,901.50
5. Step 5: Solve for x
   x = 2,260,901.50/2,189.46
6. Step 6: Final answer
   x = 1,032.63