Finding the Fourth Proportional to 22,145.50, 30,560.79 and 12,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,145.50 : 30,560.79 = 12,209.50 : x
2. Step 2: Convert to fraction form
   22,145.50/30,560.79 = 12,209.50/x
3. Step 3: Cross multiply
   22,145.50x = 30,560.79 × 12,209.50
4. Step 4: Simplify right side
   22,145.50x = 373,131,965.51
5. Step 5: Solve for x
   x = 373,131,965.51/22,145.50
6. Step 6: Final answer
   x = 16,849.11