Finding the Fourth Proportional to 11,912.88, 16,439.76 and 7,196.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,912.88 : 16,439.76 = 7,196.28 : x
2. Step 2: Convert to fraction form
   11,912.88/16,439.76 = 7,196.28/x
3. Step 3: Cross multiply
   11,912.88x = 16,439.76 × 7,196.28
4. Step 4: Simplify right side
   11,912.88x = 118,305,116.09
5. Step 5: Solve for x
   x = 118,305,116.09/11,912.88
6. Step 6: Final answer
   x = 9,930.86