Finding the Fourth Proportional to 21,289.37, 31,941.41 and 8,145.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,289.37 : 31,941.41 = 8,145.50 : x
2. Step 2: Convert to fraction form
   21,289.37/31,941.41 = 8,145.50/x
3. Step 3: Cross multiply
   21,289.37x = 31,941.41 × 8,145.50
4. Step 4: Simplify right side
   21,289.37x = 260,178,554.72
5. Step 5: Solve for x
   x = 260,178,554.72/21,289.37
6. Step 6: Final answer
   x = 12,221.06