Finding the Fourth Proportional to 21,061.20, 31,591.19 and 8,578.14

Step by Step Solution

1. Step 1: Write the proportion equation
   21,061.20 : 31,591.19 = 8,578.14 : x
2. Step 2: Convert to fraction form
   21,061.20/31,591.19 = 8,578.14/x
3. Step 3: Cross multiply
   21,061.20x = 31,591.19 × 8,578.14
4. Step 4: Simplify right side
   21,061.20x = 270,993,643.27
5. Step 5: Solve for x
   x = 270,993,643.27/21,061.20
6. Step 6: Final answer
   x = 12,866.96