Finding the Fourth Proportional to 21,801.91, 30,086.35 and 12,849.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,801.91 : 30,086.35 = 12,849.79 : x
2. Step 2: Convert to fraction form
   21,801.91/30,086.35 = 12,849.79/x
3. Step 3: Cross multiply
   21,801.91x = 30,086.35 × 12,849.79
4. Step 4: Simplify right side
   21,801.91x = 386,603,279.37
5. Step 5: Solve for x
   x = 386,603,279.37/21,801.91
6. Step 6: Final answer
   x = 17,732.54