Finding the Fourth Proportional to 2,025.69, 3,038.25 and 638.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,025.69 : 3,038.25 = 638.70 : x
2. Step 2: Convert to fraction form
   2,025.69/3,038.25 = 638.70/x
3. Step 3: Cross multiply
   2,025.69x = 3,038.25 × 638.70
4. Step 4: Simplify right side
   2,025.69x = 1,940,530.28
5. Step 5: Solve for x
   x = 1,940,530.28/2,025.69
6. Step 6: Final answer
   x = 957.96