Finding the Fourth Proportional to 21,818.04, 30,109.32 and 12,386.58

Step by Step Solution

1. Step 1: Write the proportion equation
   21,818.04 : 30,109.32 = 12,386.58 : x
2. Step 2: Convert to fraction form
   21,818.04/30,109.32 = 12,386.58/x
3. Step 3: Cross multiply
   21,818.04x = 30,109.32 × 12,386.58
4. Step 4: Simplify right side
   21,818.04x = 372,951,500.93
5. Step 5: Solve for x
   x = 372,951,500.93/21,818.04
6. Step 6: Final answer
   x = 17,093.72