Finding the Fourth Proportional to 21,818.27, 30,109.24 and 12,386.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.27 : 30,109.24 = 12,386.83 : x
2. Step 2: Convert to fraction form
   21,818.27/30,109.24 = 12,386.83/x
3. Step 3: Cross multiply
   21,818.27x = 30,109.24 × 12,386.83
4. Step 4: Simplify right side
   21,818.27x = 372,958,011.60
5. Step 5: Solve for x
   x = 372,958,011.60/21,818.27
6. Step 6: Final answer
   x = 17,093.84