Finding the Fourth Proportional to 21,764.72, 30,042.15 and 12,339.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,764.72 : 30,042.15 = 12,339.56 : x
2. Step 2: Convert to fraction form
   21,764.72/30,042.15 = 12,339.56/x
3. Step 3: Cross multiply
   21,764.72x = 30,042.15 × 12,339.56
4. Step 4: Simplify right side
   21,764.72x = 370,706,912.45
5. Step 5: Solve for x
   x = 370,706,912.45/21,764.72
6. Step 6: Final answer
   x = 17,032.47