Finding the Fourth Proportional to 21,146.72, 31,734.60 and 9,472.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,146.72 : 31,734.60 = 9,472.96 : x
2. Step 2: Convert to fraction form
   21,146.72/31,734.60 = 9,472.96/x
3. Step 3: Cross multiply
   21,146.72x = 31,734.60 × 9,472.96
4. Step 4: Simplify right side
   21,146.72x = 300,620,596.42
5. Step 5: Solve for x
   x = 300,620,596.42/21,146.72
6. Step 6: Final answer
   x = 14,215.94