Finding the Fourth Proportional to 12,913.72, 19,371.30 and 3,679

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.72 : 19,371.30 = 3,679 : x
2. Step 2: Convert to fraction form
   12,913.72/19,371.30 = 3,679/x
3. Step 3: Cross multiply
   12,913.72x = 19,371.30 × 3,679
4. Step 4: Simplify right side
   12,913.72x = 71,267,012.70
5. Step 5: Solve for x
   x = 71,267,012.70/12,913.72
6. Step 6: Final answer
   x = 5,518.71