Finding the Fourth Proportional to 12,807.95, 17,674.88 and 7,142.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,807.95 : 17,674.88 = 7,142.76 : x
2. Step 2: Convert to fraction form
   12,807.95/17,674.88 = 7,142.76/x
3. Step 3: Cross multiply
   12,807.95x = 17,674.88 × 7,142.76
4. Step 4: Simplify right side
   12,807.95x = 126,247,487.91
5. Step 5: Solve for x
   x = 126,247,487.91/12,807.95
6. Step 6: Final answer
   x = 9,856.96