Finding the Fourth Proportional to 21,630.50, 29,853.33 and 13,251.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,630.50 : 29,853.33 = 13,251.86 : x
2. Step 2: Convert to fraction form
   21,630.50/29,853.33 = 13,251.86/x
3. Step 3: Cross multiply
   21,630.50x = 29,853.33 × 13,251.86
4. Step 4: Simplify right side
   21,630.50x = 395,612,149.69
5. Step 5: Solve for x
   x = 395,612,149.69/21,630.50
6. Step 6: Final answer
   x = 18,289.55