Finding the Fourth Proportional to 21,981.73, 30,345.30 and 12,548.47

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981.73 : 30,345.30 = 12,548.47 : x
2. Step 2: Convert to fraction form
   21,981.73/30,345.30 = 12,548.47/x
3. Step 3: Cross multiply
   21,981.73x = 30,345.30 × 12,548.47
4. Step 4: Simplify right side
   21,981.73x = 380,787,086.69
5. Step 5: Solve for x
   x = 380,787,086.69/21,981.73
6. Step 6: Final answer
   x = 17,322.89