Finding the Fourth Proportional to 12,800.79, 17,665.13 and 7,424.26

Step by Step Solution

1. Step 1: Write the proportion equation
   12,800.79 : 17,665.13 = 7,424.26 : x
2. Step 2: Convert to fraction form
   12,800.79/17,665.13 = 7,424.26/x
3. Step 3: Cross multiply
   12,800.79x = 17,665.13 × 7,424.26
4. Step 4: Simplify right side
   12,800.79x = 131,150,514.77
5. Step 5: Solve for x
   x = 131,150,514.77/12,800.79
6. Step 6: Final answer
   x = 10,245.50