Finding the Fourth Proportional to 16,443.12, 22,641.78 and 13,785.90

Step by Step Solution

1. Step 1: Write the proportion equation
   16,443.12 : 22,641.78 = 13,785.90 : x
2. Step 2: Convert to fraction form
   16,443.12/22,641.78 = 13,785.90/x
3. Step 3: Cross multiply
   16,443.12x = 22,641.78 × 13,785.90
4. Step 4: Simplify right side
   16,443.12x = 312,137,314.90
5. Step 5: Solve for x
   x = 312,137,314.90/16,443.12
6. Step 6: Final answer
   x = 18,982.85