Finding the Fourth Proportional to 21,933.56, 30,265.98 and 12,981.44

Step by Step Solution

1. Step 1: Write the proportion equation
   21,933.56 : 30,265.98 = 12,981.44 : x
2. Step 2: Convert to fraction form
   21,933.56/30,265.98 = 12,981.44/x
3. Step 3: Cross multiply
   21,933.56x = 30,265.98 × 12,981.44
4. Step 4: Simplify right side
   21,933.56x = 392,896,003.41
5. Step 5: Solve for x
   x = 392,896,003.41/21,933.56
6. Step 6: Final answer
   x = 17,913.01