Finding the Fourth Proportional to 22,371.39, 30,870.72 and 12,940.56

Step by Step Solution

1. Step 1: Write the proportion equation
   22,371.39 : 30,870.72 = 12,940.56 : x
2. Step 2: Convert to fraction form
   22,371.39/30,870.72 = 12,940.56/x
3. Step 3: Cross multiply
   22,371.39x = 30,870.72 × 12,940.56
4. Step 4: Simplify right side
   22,371.39x = 399,484,404.40
5. Step 5: Solve for x
   x = 399,484,404.40/22,371.39
6. Step 6: Final answer
   x = 17,856.93