Finding the Fourth Proportional to 12,696.71, 19,017.33 and 5,278.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,696.71 : 19,017.33 = 5,278.69 : x
2. Step 2: Convert to fraction form
   12,696.71/19,017.33 = 5,278.69/x
3. Step 3: Cross multiply
   12,696.71x = 19,017.33 × 5,278.69
4. Step 4: Simplify right side
   12,696.71x = 100,386,589.70
5. Step 5: Solve for x
   x = 100,386,589.70/12,696.71
6. Step 6: Final answer
   x = 7,906.50