Finding the Fourth Proportional to 21,618.80, 32,416.98 and 8,287.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,618.80 : 32,416.98 = 8,287.86 : x
2. Step 2: Convert to fraction form
   21,618.80/32,416.98 = 8,287.86/x
3. Step 3: Cross multiply
   21,618.80x = 32,416.98 × 8,287.86
4. Step 4: Simplify right side
   21,618.80x = 268,667,391.86
5. Step 5: Solve for x
   x = 268,667,391.86/21,618.80
6. Step 6: Final answer
   x = 12,427.49