Finding the Fourth Proportional to 21,849.56, 30,151.72 and 12,289.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,849.56 : 30,151.72 = 12,289.87 : x
2. Step 2: Convert to fraction form
   21,849.56/30,151.72 = 12,289.87/x
3. Step 3: Cross multiply
   21,849.56x = 30,151.72 × 12,289.87
4. Step 4: Simplify right side
   21,849.56x = 370,560,719.08
5. Step 5: Solve for x
   x = 370,560,719.08/21,849.56
6. Step 6: Final answer
   x = 16,959.64