Finding the Fourth Proportional to 12,643.76, 17,449.24 and 7,338.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.76 : 17,449.24 = 7,338.56 : x
2. Step 2: Convert to fraction form
   12,643.76/17,449.24 = 7,338.56/x
3. Step 3: Cross multiply
   12,643.76x = 17,449.24 × 7,338.56
4. Step 4: Simplify right side
   12,643.76x = 128,052,294.69
5. Step 5: Solve for x
   x = 128,052,294.69/12,643.76
6. Step 6: Final answer
   x = 10,127.71