Finding the Fourth Proportional to 21,764.97, 30,042.50 and 12,339.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,764.97 : 30,042.50 = 12,339.81 : x
2. Step 2: Convert to fraction form
   21,764.97/30,042.50 = 12,339.81/x
3. Step 3: Cross multiply
   21,764.97x = 30,042.50 × 12,339.81
4. Step 4: Simplify right side
   21,764.97x = 370,718,680.23
5. Step 5: Solve for x
   x = 370,718,680.23/21,764.97
6. Step 6: Final answer
   x = 17,032.81