Finding the Fourth Proportional to 12,793.82, 17,655.20 and 7,128.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,793.82 : 17,655.20 = 7,128.54 : x
2. Step 2: Convert to fraction form
   12,793.82/17,655.20 = 7,128.54/x
3. Step 3: Cross multiply
   12,793.82x = 17,655.20 × 7,128.54
4. Step 4: Simplify right side
   12,793.82x = 125,855,790.50
5. Step 5: Solve for x
   x = 125,855,790.50/12,793.82
6. Step 6: Final answer
   x = 9,837.24