Finding the Fourth Proportional to 21,855.50, 30,160.62 and 11,919.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,855.50 : 30,160.62 = 11,919.50 : x
2. Step 2: Convert to fraction form
   21,855.50/30,160.62 = 11,919.50/x
3. Step 3: Cross multiply
   21,855.50x = 30,160.62 × 11,919.50
4. Step 4: Simplify right side
   21,855.50x = 359,499,510.09
5. Step 5: Solve for x
   x = 359,499,510.09/21,855.50
6. Step 6: Final answer
   x = 16,448.93