Finding the Fourth Proportional to 21,147.31, 31,725.15 and 9,460.63

Step by Step Solution

1. Step 1: Write the proportion equation
   21,147.31 : 31,725.15 = 9,460.63 : x
2. Step 2: Convert to fraction form
   21,147.31/31,725.15 = 9,460.63/x
3. Step 3: Cross multiply
   21,147.31x = 31,725.15 × 9,460.63
4. Step 4: Simplify right side
   21,147.31x = 300,139,905.84
5. Step 5: Solve for x
   x = 300,139,905.84/21,147.31
6. Step 6: Final answer
   x = 14,192.82