Finding the Fourth Proportional to 12,785.20, 17,643.56 and 7,196.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,785.20 : 17,643.56 = 7,196.24 : x
2. Step 2: Convert to fraction form
   12,785.20/17,643.56 = 7,196.24/x
3. Step 3: Cross multiply
   12,785.20x = 17,643.56 × 7,196.24
4. Step 4: Simplify right side
   12,785.20x = 126,967,292.21
5. Step 5: Solve for x
   x = 126,967,292.21/12,785.20
6. Step 6: Final answer
   x = 9,930.80