Finding the Fourth Proportional to 8,633.98, 12,942.78 and 5,505.21

Step by Step Solution

1. Step 1: Write the proportion equation
   8,633.98 : 12,942.78 = 5,505.21 : x
2. Step 2: Convert to fraction form
   8,633.98/12,942.78 = 5,505.21/x
3. Step 3: Cross multiply
   8,633.98x = 12,942.78 × 5,505.21
4. Step 4: Simplify right side
   8,633.98x = 71,252,721.88
5. Step 5: Solve for x
   x = 71,252,721.88/8,633.98
6. Step 6: Final answer
   x = 8,252.59