Finding the Fourth Proportional to 5,234.31, 7,229.76 and 3,913.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,234.31 : 7,229.76 = 3,913.89 : x
2. Step 2: Convert to fraction form
   5,234.31/7,229.76 = 3,913.89/x
3. Step 3: Cross multiply
   5,234.31x = 7,229.76 × 3,913.89
4. Step 4: Simplify right side
   5,234.31x = 28,296,485.37
5. Step 5: Solve for x
   x = 28,296,485.37/5,234.31
6. Step 6: Final answer
   x = 5,405.96