Finding the Fourth Proportional to 10,679.40, 16,020.77 and 5,131.71

Step by Step Solution

1. Step 1: Write the proportion equation
   10,679.40 : 16,020.77 = 5,131.71 : x
2. Step 2: Convert to fraction form
   10,679.40/16,020.77 = 5,131.71/x
3. Step 3: Cross multiply
   10,679.40x = 16,020.77 × 5,131.71
4. Step 4: Simplify right side
   10,679.40x = 82,213,919.96
5. Step 5: Solve for x
   x = 82,213,919.96/10,679.40
6. Step 6: Final answer
   x = 7,698.37