Finding the Fourth Proportional to 12,761.28, 19,145.76 and 3,997.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,761.28 : 19,145.76 = 3,997.12 : x
2. Step 2: Convert to fraction form
   12,761.28/19,145.76 = 3,997.12/x
3. Step 3: Cross multiply
   12,761.28x = 19,145.76 × 3,997.12
4. Step 4: Simplify right side
   12,761.28x = 76,527,900.21
5. Step 5: Solve for x
   x = 76,527,900.21/12,761.28
6. Step 6: Final answer
   x = 5,996.88