Finding the Fourth Proportional to 21,131.75, 31,706.51 and 9,279.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,131.75 : 31,706.51 = 9,279.42 : x
2. Step 2: Convert to fraction form
   21,131.75/31,706.51 = 9,279.42/x
3. Step 3: Cross multiply
   21,131.75x = 31,706.51 × 9,279.42
4. Step 4: Simplify right side
   21,131.75x = 294,218,023.02
5. Step 5: Solve for x
   x = 294,218,023.02/21,131.75
6. Step 6: Final answer
   x = 13,923.03