Finding the Fourth Proportional to 21,072.22, 31,598.98 and 11,209.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,072.22 : 31,598.98 = 11,209.25 : x
2. Step 2: Convert to fraction form
   21,072.22/31,598.98 = 11,209.25/x
3. Step 3: Cross multiply
   21,072.22x = 31,598.98 × 11,209.25
4. Step 4: Simplify right side
   21,072.22x = 354,200,917.54
5. Step 5: Solve for x
   x = 354,200,917.54/21,072.22
6. Step 6: Final answer
   x = 16,808.91