Finding the Fourth Proportional to 20,669.16, 31,007.82 and 8,186.84

Step by Step Solution

1. Step 1: Write the proportion equation
   20,669.16 : 31,007.82 = 8,186.84 : x
2. Step 2: Convert to fraction form
   20,669.16/31,007.82 = 8,186.84/x
3. Step 3: Cross multiply
   20,669.16x = 31,007.82 × 8,186.84
4. Step 4: Simplify right side
   20,669.16x = 253,856,061.09
5. Step 5: Solve for x
   x = 253,856,061.09/20,669.16
6. Step 6: Final answer
   x = 12,281.88