Finding the Fourth Proportional to 21,789.50, 30,069.52 and 11,853.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,789.50 : 30,069.52 = 11,853.50 : x
2. Step 2: Convert to fraction form
   21,789.50/30,069.52 = 11,853.50/x
3. Step 3: Cross multiply
   21,789.50x = 30,069.52 × 11,853.50
4. Step 4: Simplify right side
   21,789.50x = 356,429,055.32
5. Step 5: Solve for x
   x = 356,429,055.32/21,789.50
6. Step 6: Final answer
   x = 16,357.84