Finding the Fourth Proportional to 21,826.33, 30,120.15 and 12,394.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.33 : 30,120.15 = 12,394.69 : x
2. Step 2: Convert to fraction form
   21,826.33/30,120.15 = 12,394.69/x
3. Step 3: Cross multiply
   21,826.33x = 30,120.15 × 12,394.69
4. Step 4: Simplify right side
   21,826.33x = 373,329,893.18
5. Step 5: Solve for x
   x = 373,329,893.18/21,826.33
6. Step 6: Final answer
   x = 17,104.57