Finding the Fourth Proportional to 12,143.79, 16,757.48 and 7,107.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,143.79 : 16,757.48 = 7,107.31 : x
2. Step 2: Convert to fraction form
   12,143.79/16,757.48 = 7,107.31/x
3. Step 3: Cross multiply
   12,143.79x = 16,757.48 × 7,107.31
4. Step 4: Simplify right side
   12,143.79x = 119,100,643.89
5. Step 5: Solve for x
   x = 119,100,643.89/12,143.79
6. Step 6: Final answer
   x = 9,807.53