Finding the Fourth Proportional to 21,817.35, 30,106.89 and 12,385.71

Step by Step Solution

1. Step 1: Write the proportion equation
   21,817.35 : 30,106.89 = 12,385.71 : x
2. Step 2: Convert to fraction form
   21,817.35/30,106.89 = 12,385.71/x
3. Step 3: Cross multiply
   21,817.35x = 30,106.89 × 12,385.71
4. Step 4: Simplify right side
   21,817.35x = 372,895,208.54
5. Step 5: Solve for x
   x = 372,895,208.54/21,817.35
6. Step 6: Final answer
   x = 17,091.68