Finding the Fourth Proportional to 21,945.18, 30,282.15 and 12,384.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,945.18 : 30,282.15 = 12,384.20 : x
2. Step 2: Convert to fraction form
   21,945.18/30,282.15 = 12,384.20/x
3. Step 3: Cross multiply
   21,945.18x = 30,282.15 × 12,384.20
4. Step 4: Simplify right side
   21,945.18x = 375,020,050.62
5. Step 5: Solve for x
   x = 375,020,050.62/21,945.18
6. Step 6: Final answer
   x = 17,088.95