Finding the Fourth Proportional to 21,454.43, 29,603.93 and 12,255.31

Step by Step Solution

1. Step 1: Write the proportion equation
   21,454.43 : 29,603.93 = 12,255.31 : x
2. Step 2: Convert to fraction form
   21,454.43/29,603.93 = 12,255.31/x
3. Step 3: Cross multiply
   21,454.43x = 29,603.93 × 12,255.31
4. Step 4: Simplify right side
   21,454.43x = 362,805,339.37
5. Step 5: Solve for x
   x = 362,805,339.37/21,454.43
6. Step 6: Final answer
   x = 16,910.51