Finding the Fourth Proportional to 12,680.75, 19,008.03 and 5,289.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.75 : 19,008.03 = 5,289.50 : x
2. Step 2: Convert to fraction form
   12,680.75/19,008.03 = 5,289.50/x
3. Step 3: Cross multiply
   12,680.75x = 19,008.03 × 5,289.50
4. Step 4: Simplify right side
   12,680.75x = 100,542,974.69
5. Step 5: Solve for x
   x = 100,542,974.69/12,680.75
6. Step 6: Final answer
   x = 7,928.79