Finding the Fourth Proportional to 21,933.75, 30,268.86 and 12,981.03

Step by Step Solution

1. Step 1: Write the proportion equation
   21,933.75 : 30,268.86 = 12,981.03 : x
2. Step 2: Convert to fraction form
   21,933.75/30,268.86 = 12,981.03/x
3. Step 3: Cross multiply
   21,933.75x = 30,268.86 × 12,981.03
4. Step 4: Simplify right side
   21,933.75x = 392,920,979.73
5. Step 5: Solve for x
   x = 392,920,979.73/21,933.75
6. Step 6: Final answer
   x = 17,913.99