Finding the Fourth Proportional to 5,729.31, 7,906.42 and 3,211.42

Step by Step Solution

1. Step 1: Write the proportion equation
   5,729.31 : 7,906.42 = 3,211.42 : x
2. Step 2: Convert to fraction form
   5,729.31/7,906.42 = 3,211.42/x
3. Step 3: Cross multiply
   5,729.31x = 7,906.42 × 3,211.42
4. Step 4: Simplify right side
   5,729.31x = 25,390,819.56
5. Step 5: Solve for x
   x = 25,390,819.56/5,729.31
6. Step 6: Final answer
   x = 4,431.74