Finding the Fourth Proportional to 8,537.31, 12,805.25 and 3,920.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,537.31 : 12,805.25 = 3,920.31 : x
2. Step 2: Convert to fraction form
   8,537.31/12,805.25 = 3,920.31/x
3. Step 3: Cross multiply
   8,537.31x = 12,805.25 × 3,920.31
4. Step 4: Simplify right side
   8,537.31x = 50,200,530.03
5. Step 5: Solve for x
   x = 50,200,530.03/8,537.31
6. Step 6: Final answer
   x = 5,880.13