Finding the Fourth Proportional to 21,210.15, 31,819.32 and 8,061.49

Step by Step Solution

1. Step 1: Write the proportion equation
   21,210.15 : 31,819.32 = 8,061.49 : x
2. Step 2: Convert to fraction form
   21,210.15/31,819.32 = 8,061.49/x
3. Step 3: Cross multiply
   21,210.15x = 31,819.32 × 8,061.49
4. Step 4: Simplify right side
   21,210.15x = 256,511,089.68
5. Step 5: Solve for x
   x = 256,511,089.68/21,210.15
6. Step 6: Final answer
   x = 12,093.79