Finding the Fourth Proportional to 21,940.72, 30,265.89 and 13,446.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,940.72 : 30,265.89 = 13,446.96 : x
2. Step 2: Convert to fraction form
   21,940.72/30,265.89 = 13,446.96/x
3. Step 3: Cross multiply
   21,940.72x = 30,265.89 × 13,446.96
4. Step 4: Simplify right side
   21,940.72x = 406,984,212.19
5. Step 5: Solve for x
   x = 406,984,212.19/21,940.72
6. Step 6: Final answer
   x = 18,549.26