Finding the Fourth Proportional to 21,563.72, 32,339.10 and 8,412.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,563.72 : 32,339.10 = 8,412.56 : x
2. Step 2: Convert to fraction form
   21,563.72/32,339.10 = 8,412.56/x
3. Step 3: Cross multiply
   21,563.72x = 32,339.10 × 8,412.56
4. Step 4: Simplify right side
   21,563.72x = 272,054,619.10
5. Step 5: Solve for x
   x = 272,054,619.10/21,563.72
6. Step 6: Final answer
   x = 12,616.31