Finding the Fourth Proportional to 10,686.99, 16,040.82 and 5,144.16

Step by Step Solution

1. Step 1: Write the proportion equation
   10,686.99 : 16,040.82 = 5,144.16 : x
2. Step 2: Convert to fraction form
   10,686.99/16,040.82 = 5,144.16/x
3. Step 3: Cross multiply
   10,686.99x = 16,040.82 × 5,144.16
4. Step 4: Simplify right side
   10,686.99x = 82,516,544.61
5. Step 5: Solve for x
   x = 82,516,544.61/10,686.99
6. Step 6: Final answer
   x = 7,721.21