Finding the Fourth Proportional to 21,818.32, 30,107.12 and 12,386.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.32 : 30,107.12 = 12,386.80 : x
2. Step 2: Convert to fraction form
   21,818.32/30,107.12 = 12,386.80/x
3. Step 3: Cross multiply
   21,818.32x = 30,107.12 × 12,386.80
4. Step 4: Simplify right side
   21,818.32x = 372,930,874.02
5. Step 5: Solve for x
   x = 372,930,874.02/21,818.32
6. Step 6: Final answer
   x = 17,092.56