Finding the Fourth Proportional to 21,144.72, 31,731.60 and 9,470.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,144.72 : 31,731.60 = 9,470.96 : x
2. Step 2: Convert to fraction form
   21,144.72/31,731.60 = 9,470.96/x
3. Step 3: Cross multiply
   21,144.72x = 31,731.60 × 9,470.96
4. Step 4: Simplify right side
   21,144.72x = 300,528,714.34
5. Step 5: Solve for x
   x = 300,528,714.34/21,144.72
6. Step 6: Final answer
   x = 14,212.94