Finding the Fourth Proportional to 21,853.50, 30,157.83 and 11,917.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,853.50 : 30,157.83 = 11,917.50 : x
2. Step 2: Convert to fraction form
   21,853.50/30,157.83 = 11,917.50/x
3. Step 3: Cross multiply
   21,853.50x = 30,157.83 × 11,917.50
4. Step 4: Simplify right side
   21,853.50x = 359,405,939.03
5. Step 5: Solve for x
   x = 359,405,939.03/21,853.50
6. Step 6: Final answer
   x = 16,446.15