Finding the Fourth Proportional to 12,643.92, 17,447.40 and 7,055.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.92 : 17,447.40 = 7,055.28 : x
2. Step 2: Convert to fraction form
   12,643.92/17,447.40 = 7,055.28/x
3. Step 3: Cross multiply
   12,643.92x = 17,447.40 × 7,055.28
4. Step 4: Simplify right side
   12,643.92x = 123,096,292.27
5. Step 5: Solve for x
   x = 123,096,292.27/12,643.92
6. Step 6: Final answer
   x = 9,735.61