Finding the Fourth Proportional to 21,641.58, 32,440.50 and 8,488.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,641.58 : 32,440.50 = 8,488.80 : x
2. Step 2: Convert to fraction form
   21,641.58/32,440.50 = 8,488.80/x
3. Step 3: Cross multiply
   21,641.58x = 32,440.50 × 8,488.80
4. Step 4: Simplify right side
   21,641.58x = 275,380,916.40
5. Step 5: Solve for x
   x = 275,380,916.40/21,641.58
6. Step 6: Final answer
   x = 12,724.62