Finding the Fourth Proportional to 10,690.99, 16,039.97 and 5,144.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,690.99 : 16,039.97 = 5,144.78 : x
2. Step 2: Convert to fraction form
   10,690.99/16,039.97 = 5,144.78/x
3. Step 3: Cross multiply
   10,690.99x = 16,039.97 × 5,144.78
4. Step 4: Simplify right side
   10,690.99x = 82,522,116.86
5. Step 5: Solve for x
   x = 82,522,116.86/10,690.99
6. Step 6: Final answer
   x = 7,718.85