Finding the Fourth Proportional to 11,969.14, 16,519.38 and 9,131.16

Step by Step Solution

1. Step 1: Write the proportion equation
   11,969.14 : 16,519.38 = 9,131.16 : x
2. Step 2: Convert to fraction form
   11,969.14/16,519.38 = 9,131.16/x
3. Step 3: Cross multiply
   11,969.14x = 16,519.38 × 9,131.16
4. Step 4: Simplify right side
   11,969.14x = 150,841,101.88
5. Step 5: Solve for x
   x = 150,841,101.88/11,969.14
6. Step 6: Final answer
   x = 12,602.50