Finding the Fourth Proportional to 8,644.58, 12,959.31 and 7,336.79

Step by Step Solution

1. Step 1: Write the proportion equation
   8,644.58 : 12,959.31 = 7,336.79 : x
2. Step 2: Convert to fraction form
   8,644.58/12,959.31 = 7,336.79/x
3. Step 3: Cross multiply
   8,644.58x = 12,959.31 × 7,336.79
4. Step 4: Simplify right side
   8,644.58x = 95,079,736.01
5. Step 5: Solve for x
   x = 95,079,736.01/8,644.58
6. Step 6: Final answer
   x = 10,998.77