Finding the Fourth Proportional to 12,793.69, 17,655.22 and 7,128.51

Step by Step Solution

1. Step 1: Write the proportion equation
   12,793.69 : 17,655.22 = 7,128.51 : x
2. Step 2: Convert to fraction form
   12,793.69/17,655.22 = 7,128.51/x
3. Step 3: Cross multiply
   12,793.69x = 17,655.22 × 7,128.51
4. Step 4: Simplify right side
   12,793.69x = 125,855,412.32
5. Step 5: Solve for x
   x = 125,855,412.32/12,793.69
6. Step 6: Final answer
   x = 9,837.30