Finding the Fourth Proportional to 21,148.58, 31,722.83 and 8,668.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,148.58 : 31,722.83 = 8,668.62 : x
2. Step 2: Convert to fraction form
   21,148.58/31,722.83 = 8,668.62/x
3. Step 3: Cross multiply
   21,148.58x = 31,722.83 × 8,668.62
4. Step 4: Simplify right side
   21,148.58x = 274,993,158.59
5. Step 5: Solve for x
   x = 274,993,158.59/21,148.58
6. Step 6: Final answer
   x = 13,002.91