Finding the Fourth Proportional to 21,604.88, 32,421.01 and 8,456.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,604.88 : 32,421.01 = 8,456.91 : x
2. Step 2: Convert to fraction form
   21,604.88/32,421.01 = 8,456.91/x
3. Step 3: Cross multiply
   21,604.88x = 32,421.01 × 8,456.91
4. Step 4: Simplify right side
   21,604.88x = 274,181,436.81
5. Step 5: Solve for x
   x = 274,181,436.81/21,604.88
6. Step 6: Final answer
   x = 12,690.72