Finding the Fourth Proportional to 8,456.70, 12,681.84 and 3,389.34

Step by Step Solution

1. Step 1: Write the proportion equation
   8,456.70 : 12,681.84 = 3,389.34 : x
2. Step 2: Convert to fraction form
   8,456.70/12,681.84 = 3,389.34/x
3. Step 3: Cross multiply
   8,456.70x = 12,681.84 × 3,389.34
4. Step 4: Simplify right side
   8,456.70x = 42,983,067.59
5. Step 5: Solve for x
   x = 42,983,067.59/8,456.70
6. Step 6: Final answer
   x = 5,082.72