Finding the Fourth Proportional to 21,926.69, 30,256.49 and 12,974.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,926.69 : 30,256.49 = 12,974.57 : x
2. Step 2: Convert to fraction form
   21,926.69/30,256.49 = 12,974.57/x
3. Step 3: Cross multiply
   21,926.69x = 30,256.49 × 12,974.57
4. Step 4: Simplify right side
   21,926.69x = 392,564,828.61
5. Step 5: Solve for x
   x = 392,564,828.61/21,926.69
6. Step 6: Final answer
   x = 17,903.52