Finding the Fourth Proportional to 3,401.73, 5,099.88 and 3,128.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,401.73 : 5,099.88 = 3,128.37 : x
2. Step 2: Convert to fraction form
   3,401.73/5,099.88 = 3,128.37/x
3. Step 3: Cross multiply
   3,401.73x = 5,099.88 × 3,128.37
4. Step 4: Simplify right side
   3,401.73x = 15,954,311.60
5. Step 5: Solve for x
   x = 15,954,311.60/3,401.73
6. Step 6: Final answer
   x = 4,690.06