Finding the Fourth Proportional to 3,938.29, 5,431.56 and 2,945.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,938.29 : 5,431.56 = 2,945.94 : x
2. Step 2: Convert to fraction form
   3,938.29/5,431.56 = 2,945.94/x
3. Step 3: Cross multiply
   3,938.29x = 5,431.56 × 2,945.94
4. Step 4: Simplify right side
   3,938.29x = 16,001,018.45
5. Step 5: Solve for x
   x = 16,001,018.45/3,938.29
6. Step 6: Final answer
   x = 4,062.94