Finding the Fourth Proportional to 20,659.72, 28,510.50 and 12,276.04

Step by Step Solution

1. Step 1: Write the proportion equation
   20,659.72 : 28,510.50 = 12,276.04 : x
2. Step 2: Convert to fraction form
   20,659.72/28,510.50 = 12,276.04/x
3. Step 3: Cross multiply
   20,659.72x = 28,510.50 × 12,276.04
4. Step 4: Simplify right side
   20,659.72x = 349,996,038.42
5. Step 5: Solve for x
   x = 349,996,038.42/20,659.72
6. Step 6: Final answer
   x = 16,940.99