Finding the Fourth Proportional to 12,899.07, 19,334.89 and 8,204.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.07 : 19,334.89 = 8,204.31 : x
2. Step 2: Convert to fraction form
   12,899.07/19,334.89 = 8,204.31/x
3. Step 3: Cross multiply
   12,899.07x = 19,334.89 × 8,204.31
4. Step 4: Simplify right side
   12,899.07x = 158,629,431.38
5. Step 5: Solve for x
   x = 158,629,431.38/12,899.07
6. Step 6: Final answer
   x = 12,297.74