Finding the Fourth Proportional to 21,145.91, 31,717.07 and 8,662.37

Step by Step Solution

1. Step 1: Write the proportion equation
   21,145.91 : 31,717.07 = 8,662.37 : x
2. Step 2: Convert to fraction form
   21,145.91/31,717.07 = 8,662.37/x
3. Step 3: Cross multiply
   21,145.91x = 31,717.07 × 8,662.37
4. Step 4: Simplify right side
   21,145.91x = 274,744,952.34
5. Step 5: Solve for x
   x = 274,744,952.34/21,145.91
6. Step 6: Final answer
   x = 12,992.82