Finding the Fourth Proportional to 21,034.62, 31,553.61 and 12,270.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.62 : 31,553.61 = 12,270.42 : x
2. Step 2: Convert to fraction form
   21,034.62/31,553.61 = 12,270.42/x
3. Step 3: Cross multiply
   21,034.62x = 31,553.61 × 12,270.42
4. Step 4: Simplify right side
   21,034.62x = 387,176,047.22
5. Step 5: Solve for x
   x = 387,176,047.22/21,034.62
6. Step 6: Final answer
   x = 18,406.61