Finding the Fourth Proportional to 4,939.59, 7,408.28 and 1,428.81

Step by Step Solution

1. Step 1: Write the proportion equation
   4,939.59 : 7,408.28 = 1,428.81 : x
2. Step 2: Convert to fraction form
   4,939.59/7,408.28 = 1,428.81/x
3. Step 3: Cross multiply
   4,939.59x = 7,408.28 × 1,428.81
4. Step 4: Simplify right side
   4,939.59x = 10,585,017.40
5. Step 5: Solve for x
   x = 10,585,017.40/4,939.59
6. Step 6: Final answer
   x = 2,142.89