Finding the Fourth Proportional to 21,895.52, 30,218.04 and 12,945.92

Step by Step Solution

1. Step 1: Write the proportion equation
   21,895.52 : 30,218.04 = 12,945.92 : x
2. Step 2: Convert to fraction form
   21,895.52/30,218.04 = 12,945.92/x
3. Step 3: Cross multiply
   21,895.52x = 30,218.04 × 12,945.92
4. Step 4: Simplify right side
   21,895.52x = 391,200,328.40
5. Step 5: Solve for x
   x = 391,200,328.40/21,895.52
6. Step 6: Final answer
   x = 17,866.68