Finding the Fourth Proportional to 21,085.38, 31,657.23 and 10,704.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,085.38 : 31,657.23 = 10,704.42 : x
2. Step 2: Convert to fraction form
   21,085.38/31,657.23 = 10,704.42/x
3. Step 3: Cross multiply
   21,085.38x = 31,657.23 × 10,704.42
4. Step 4: Simplify right side
   21,085.38x = 338,872,285.96
5. Step 5: Solve for x
   x = 338,872,285.96/21,085.38
6. Step 6: Final answer
   x = 16,071.43