Finding the Fourth Proportional to 21,086.43, 29,100.78 and 11,654.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,086.43 : 29,100.78 = 11,654.79 : x
2. Step 2: Convert to fraction form
   21,086.43/29,100.78 = 11,654.79/x
3. Step 3: Cross multiply
   21,086.43x = 29,100.78 × 11,654.79
4. Step 4: Simplify right side
   21,086.43x = 339,163,479.74
5. Step 5: Solve for x
   x = 339,163,479.74/21,086.43
6. Step 6: Final answer
   x = 16,084.44