Finding the Fourth Proportional to 12,873.69, 17,765.56 and 7,208.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,873.69 : 17,765.56 = 7,208.49 : x
2. Step 2: Convert to fraction form
   12,873.69/17,765.56 = 7,208.49/x
3. Step 3: Cross multiply
   12,873.69x = 17,765.56 × 7,208.49
4. Step 4: Simplify right side
   12,873.69x = 128,062,825.56
5. Step 5: Solve for x
   x = 128,062,825.56/12,873.69
6. Step 6: Final answer
   x = 9,947.64