Finding the Fourth Proportional to 8,859.91, 12,221.27 and 5,272.46

Step by Step Solution

1. Step 1: Write the proportion equation
   8,859.91 : 12,221.27 = 5,272.46 : x
2. Step 2: Convert to fraction form
   8,859.91/12,221.27 = 5,272.46/x
3. Step 3: Cross multiply
   8,859.91x = 12,221.27 × 5,272.46
4. Step 4: Simplify right side
   8,859.91x = 64,436,217.41
5. Step 5: Solve for x
   x = 64,436,217.41/8,859.91
6. Step 6: Final answer
   x = 7,272.78