Finding the Fourth Proportional to 20,628.50, 28,474.72 and 12,245

Step by Step Solution

1. Step 1: Write the proportion equation
   20,628.50 : 28,474.72 = 12,245 : x
2. Step 2: Convert to fraction form
   20,628.50/28,474.72 = 12,245/x
3. Step 3: Cross multiply
   20,628.50x = 28,474.72 × 12,245
4. Step 4: Simplify right side
   20,628.50x = 348,672,946.40
5. Step 5: Solve for x
   x = 348,672,946.40/20,628.50
6. Step 6: Final answer
   x = 16,902.49