Finding the Fourth Proportional to 12,807.96, 17,674.90 and 7,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.96 : 17,674.90 = 7,142.76 : x
2. Step 2: Convert to fraction form
   12,807.96/17,674.90 = 7,142.76/x
3. Step 3: Cross multiply
   12,807.96x = 17,674.90 × 7,142.76
4. Step 4: Simplify right side
   12,807.96x = 126,247,568.72
5. Step 5: Solve for x
   x = 126,247,568.72/12,807.96
6. Step 6: Final answer
   x = 9,856.96