Finding the Fourth Proportional to 21,826.32, 30,120.53 and 12,394.95

Step by Step Solution

1. Step 1: Write the proportion equation
   21,826.32 : 30,120.53 = 12,394.95 : x
2. Step 2: Convert to fraction form
   21,826.32/30,120.53 = 12,394.95/x
3. Step 3: Cross multiply
   21,826.32x = 30,120.53 × 12,394.95
4. Step 4: Simplify right side
   21,826.32x = 373,342,372.53
5. Step 5: Solve for x
   x = 373,342,372.53/21,826.32
6. Step 6: Final answer
   x = 17,105.15