Finding the Fourth Proportional to 21,196.05, 31,797.72 and 8,722.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,196.05 : 31,797.72 = 8,722.86 : x
2. Step 2: Convert to fraction form
   21,196.05/31,797.72 = 8,722.86/x
3. Step 3: Cross multiply
   21,196.05x = 31,797.72 × 8,722.86
4. Step 4: Simplify right side
   21,196.05x = 277,367,059.88
5. Step 5: Solve for x
   x = 277,367,059.88/21,196.05
6. Step 6: Final answer
   x = 13,085.79