Finding the Fourth Proportional to 16,814.39, 23,207.72 and 9,642.85

Step by Step Solution

1. Step 1: Write the proportion equation
   16,814.39 : 23,207.72 = 9,642.85 : x
2. Step 2: Convert to fraction form
   16,814.39/23,207.72 = 9,642.85/x
3. Step 3: Cross multiply
   16,814.39x = 23,207.72 × 9,642.85
4. Step 4: Simplify right side
   16,814.39x = 223,788,456.57
5. Step 5: Solve for x
   x = 223,788,456.57/16,814.39
6. Step 6: Final answer
   x = 13,309.35