Finding the Fourth Proportional to 8,391.90, 12,585.42 and 3,196.56

Step by Step Solution

1. Step 1: Write the proportion equation
   8,391.90 : 12,585.42 = 3,196.56 : x
2. Step 2: Convert to fraction form
   8,391.90/12,585.42 = 3,196.56/x
3. Step 3: Cross multiply
   8,391.90x = 12,585.42 × 3,196.56
4. Step 4: Simplify right side
   8,391.90x = 40,230,050.16
5. Step 5: Solve for x
   x = 40,230,050.16/8,391.90
6. Step 6: Final answer
   x = 4,793.91