Finding the Fourth Proportional to 3,938.89, 5,435.42 and 2,260.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.89 : 5,435.42 = 2,260.43 : x
2. Step 2: Convert to fraction form
   3,938.89/5,435.42 = 2,260.43/x
3. Step 3: Cross multiply
   3,938.89x = 5,435.42 × 2,260.43
4. Step 4: Simplify right side
   3,938.89x = 12,286,382.76
5. Step 5: Solve for x
   x = 12,286,382.76/3,938.89
6. Step 6: Final answer
   x = 3,119.25