Finding the Fourth Proportional to 12,979.28, 17,912.81 and 7,946.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979.28 : 17,912.81 = 7,946.89 : x
2. Step 2: Convert to fraction form
   12,979.28/17,912.81 = 7,946.89/x
3. Step 3: Cross multiply
   12,979.28x = 17,912.81 × 7,946.89
4. Step 4: Simplify right side
   12,979.28x = 142,351,105.75
5. Step 5: Solve for x
   x = 142,351,105.75/12,979.28
6. Step 6: Final answer
   x = 10,967.56