Finding the Fourth Proportional to 6,821.91, 10,234.71 and 3,902.31

Step by Step Solution

1. Step 1: Write the proportion equation
   6,821.91 : 10,234.71 = 3,902.31 : x
2. Step 2: Convert to fraction form
   6,821.91/10,234.71 = 3,902.31/x
3. Step 3: Cross multiply
   6,821.91x = 10,234.71 × 3,902.31
4. Step 4: Simplify right side
   6,821.91x = 39,939,011.18
5. Step 5: Solve for x
   x = 39,939,011.18/6,821.91
6. Step 6: Final answer
   x = 5,854.52