Finding the Fourth Proportional to 20,491.04, 28,284.72 and 12,107

Step by Step Solution

1. Step 1: Write the proportion equation
   20,491.04 : 28,284.72 = 12,107 : x
2. Step 2: Convert to fraction form
   20,491.04/28,284.72 = 12,107/x
3. Step 3: Cross multiply
   20,491.04x = 28,284.72 × 12,107
4. Step 4: Simplify right side
   20,491.04x = 342,443,105.04
5. Step 5: Solve for x
   x = 342,443,105.04/20,491.04
6. Step 6: Final answer
   x = 16,711.85