Finding the Fourth Proportional to 21,278.08, 31,919.25 and 8,141.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,278.08 : 31,919.25 = 8,141.50 : x
2. Step 2: Convert to fraction form
   21,278.08/31,919.25 = 8,141.50/x
3. Step 3: Cross multiply
   21,278.08x = 31,919.25 × 8,141.50
4. Step 4: Simplify right side
   21,278.08x = 259,870,573.88
5. Step 5: Solve for x
   x = 259,870,573.88/21,278.08
6. Step 6: Final answer
   x = 12,213.06