Finding the Fourth Proportional to 22,287, 30,756.06 and 12,856.98

Step by Step Solution

1. Step 1: Write the proportion equation
   22,287 : 30,756.06 = 12,856.98 : x
2. Step 2: Convert to fraction form
   22,287/30,756.06 = 12,856.98/x
3. Step 3: Cross multiply
   22,287x = 30,756.06 × 12,856.98
4. Step 4: Simplify right side
   22,287x = 395,430,048.30
5. Step 5: Solve for x
   x = 395,430,048.30/22,287
6. Step 6: Final answer
   x = 17,742.63