Finding the Fourth Proportional to 12,899.46, 17,804.43 and 7,866.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,899.46 : 17,804.43 = 7,866.46 : x
2. Step 2: Convert to fraction form
   12,899.46/17,804.43 = 7,866.46/x
3. Step 3: Cross multiply
   12,899.46x = 17,804.43 × 7,866.46
4. Step 4: Simplify right side
   12,899.46x = 140,057,791.91
5. Step 5: Solve for x
   x = 140,057,791.91/12,899.46
6. Step 6: Final answer
   x = 10,857.65