Finding the Fourth Proportional to 11,969.31, 17,946.45 and 8,685.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,969.31 : 17,946.45 = 8,685.15 : x
2. Step 2: Convert to fraction form
   11,969.31/17,946.45 = 8,685.15/x
3. Step 3: Cross multiply
   11,969.31x = 17,946.45 × 8,685.15
4. Step 4: Simplify right side
   11,969.31x = 155,867,610.22
5. Step 5: Solve for x
   x = 155,867,610.22/11,969.31
6. Step 6: Final answer
   x = 13,022.27