Finding the Fourth Proportional to 10,749.36, 16,109.01 and 9,159.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,749.36 : 16,109.01 = 9,159.78 : x
2. Step 2: Convert to fraction form
   10,749.36/16,109.01 = 9,159.78/x
3. Step 3: Cross multiply
   10,749.36x = 16,109.01 × 9,159.78
4. Step 4: Simplify right side
   10,749.36x = 147,555,048.03
5. Step 5: Solve for x
   x = 147,555,048.03/10,749.36
6. Step 6: Final answer
   x = 13,726.87