Finding the Fourth Proportional to 10,519.47, 14,499.81 and 9,928.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,519.47 : 14,499.81 = 9,928.98 : x
2. Step 2: Convert to fraction form
   10,519.47/14,499.81 = 9,928.98/x
3. Step 3: Cross multiply
   10,519.47x = 14,499.81 × 9,928.98
4. Step 4: Simplify right side
   10,519.47x = 143,968,323.49
5. Step 5: Solve for x
   x = 143,968,323.49/10,519.47
6. Step 6: Final answer
   x = 13,685.89