Finding the Fourth Proportional to 21,818.28, 30,109.86 and 12,386.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.28 : 30,109.86 = 12,386.52 : x
2. Step 2: Convert to fraction form
   21,818.28/30,109.86 = 12,386.52/x
3. Step 3: Cross multiply
   21,818.28x = 30,109.86 × 12,386.52
4. Step 4: Simplify right side
   21,818.28x = 372,956,383.09
5. Step 5: Solve for x
   x = 372,956,383.09/21,818.28
6. Step 6: Final answer
   x = 17,093.76