Finding the Fourth Proportional to 11,145.98, 16,619.32 and 10,839.80

Step by Step Solution

1. Step 1: Write the proportion equation
   11,145.98 : 16,619.32 = 10,839.80 : x
2. Step 2: Convert to fraction form
   11,145.98/16,619.32 = 10,839.80/x
3. Step 3: Cross multiply
   11,145.98x = 16,619.32 × 10,839.80
4. Step 4: Simplify right side
   11,145.98x = 180,150,104.94
5. Step 5: Solve for x
   x = 180,150,104.94/11,145.98
6. Step 6: Final answer
   x = 16,162.79