Finding the Fourth Proportional to 20,674.89, 28,520.83 and 13,509.00

Step by Step Solution

1. Step 1: Write the proportion equation
   20,674.89 : 28,520.83 = 13,509.00 : x
2. Step 2: Convert to fraction form
   20,674.89/28,520.83 = 13,509.00/x
3. Step 3: Cross multiply
   20,674.89x = 28,520.83 × 13,509.00
4. Step 4: Simplify right side
   20,674.89x = 385,287,763.00
5. Step 5: Solve for x
   x = 385,287,763.00/20,674.89
6. Step 6: Final answer
   x = 18,635.54