Finding the Fourth Proportional to 8,488.34, 12,719.49 and 3,555.28

Step by Step Solution

1. Step 1: Write the proportion equation
   8,488.34 : 12,719.49 = 3,555.28 : x
2. Step 2: Convert to fraction form
   8,488.34/12,719.49 = 3,555.28/x
3. Step 3: Cross multiply
   8,488.34x = 12,719.49 × 3,555.28
4. Step 4: Simplify right side
   8,488.34x = 45,221,348.41
5. Step 5: Solve for x
   x = 45,221,348.41/8,488.34
6. Step 6: Final answer
   x = 5,327.47