Finding the Fourth Proportional to 12,808.28, 17,674.62 and 7,143.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808.28 : 17,674.62 = 7,143.86 : x
2. Step 2: Convert to fraction form
   12,808.28/17,674.62 = 7,143.86/x
3. Step 3: Cross multiply
   12,808.28x = 17,674.62 × 7,143.86
4. Step 4: Simplify right side
   12,808.28x = 126,265,010.83
5. Step 5: Solve for x
   x = 126,265,010.83/12,808.28
6. Step 6: Final answer
   x = 9,858.08