Finding the Fourth Proportional to 3,839.11, 5,728.71 and 3,425.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,839.11 : 5,728.71 = 3,425.40 : x
2. Step 2: Convert to fraction form
   3,839.11/5,728.71 = 3,425.40/x
3. Step 3: Cross multiply
   3,839.11x = 5,728.71 × 3,425.40
4. Step 4: Simplify right side
   3,839.11x = 19,623,123.23
5. Step 5: Solve for x
   x = 19,623,123.23/3,839.11
6. Step 6: Final answer
   x = 5,111.38