Finding the Fourth Proportional to 12,698.71, 19,020.33 and 5,280.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,698.71 : 19,020.33 = 5,280.69 : x
2. Step 2: Convert to fraction form
   12,698.71/19,020.33 = 5,280.69/x
3. Step 3: Cross multiply
   12,698.71x = 19,020.33 × 5,280.69
4. Step 4: Simplify right side
   12,698.71x = 100,440,466.43
5. Step 5: Solve for x
   x = 100,440,466.43/12,698.71
6. Step 6: Final answer
   x = 7,909.50