Finding the Fourth Proportional to 21,863.26, 30,171.72 and 12,432.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,863.26 : 30,171.72 = 12,432.16 : x
2. Step 2: Convert to fraction form
   21,863.26/30,171.72 = 12,432.16/x
3. Step 3: Cross multiply
   21,863.26x = 30,171.72 × 12,432.16
4. Step 4: Simplify right side
   21,863.26x = 375,099,650.52
5. Step 5: Solve for x
   x = 375,099,650.52/21,863.26
6. Step 6: Final answer
   x = 17,156.62