Finding the Fourth Proportional to 8,456.12, 12,686.34 and 3,191.48

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.12 : 12,686.34 = 3,191.48 : x
2. Step 2: Convert to fraction form
   8,456.12/12,686.34 = 3,191.48/x
3. Step 3: Cross multiply
   8,456.12x = 12,686.34 × 3,191.48
4. Step 4: Simplify right side
   8,456.12x = 40,488,200.38
5. Step 5: Solve for x
   x = 40,488,200.38/8,456.12
6. Step 6: Final answer
   x = 4,788.04