Finding the Fourth Proportional to 3,938.58, 5,435.37 and 2,260.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.58 : 5,435.37 = 2,260.30 : x
2. Step 2: Convert to fraction form
   3,938.58/5,435.37 = 2,260.30/x
3. Step 3: Cross multiply
   3,938.58x = 5,435.37 × 2,260.30
4. Step 4: Simplify right side
   3,938.58x = 12,285,547.57
5. Step 5: Solve for x
   x = 12,285,547.57/3,938.58
6. Step 6: Final answer
   x = 3,119.28