Finding the Fourth Proportional to 2,282.69, 3,423.78 and 639.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,282.69 : 3,423.78 = 639.37 : x
2. Step 2: Convert to fraction form
   2,282.69/3,423.78 = 639.37/x
3. Step 3: Cross multiply
   2,282.69x = 3,423.78 × 639.37
4. Step 4: Simplify right side
   2,282.69x = 2,189,062.22
5. Step 5: Solve for x
   x = 2,189,062.22/2,282.69
6. Step 6: Final answer
   x = 958.98