Finding the Fourth Proportional to 20,520.76, 30,784.42 and 8,674.62

Step by Step Solution

1. Step 1: Write the proportion equation
   20,520.76 : 30,784.42 = 8,674.62 : x
2. Step 2: Convert to fraction form
   20,520.76/30,784.42 = 8,674.62/x
3. Step 3: Cross multiply
   20,520.76x = 30,784.42 × 8,674.62
4. Step 4: Simplify right side
   20,520.76x = 267,043,145.42
5. Step 5: Solve for x
   x = 267,043,145.42/20,520.76
6. Step 6: Final answer
   x = 13,013.32