Finding the Fourth Proportional to 21,150.49, 31,725.96 and 8,667.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,150.49 : 31,725.96 = 8,667.31 : x
2. Step 2: Convert to fraction form
   21,150.49/31,725.96 = 8,667.31/x
3. Step 3: Cross multiply
   21,150.49x = 31,725.96 × 8,667.31
4. Step 4: Simplify right side
   21,150.49x = 274,978,730.37
5. Step 5: Solve for x
   x = 274,978,730.37/21,150.49
6. Step 6: Final answer
   x = 13,001.06