Finding the Fourth Proportional to 21,821.79, 30,116.94 and 13,322.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.79 : 30,116.94 = 13,322.16 : x
2. Step 2: Convert to fraction form
   21,821.79/30,116.94 = 13,322.16/x
3. Step 3: Cross multiply
   21,821.79x = 30,116.94 × 13,322.16
4. Step 4: Simplify right side
   21,821.79x = 401,222,693.39
5. Step 5: Solve for x
   x = 401,222,693.39/21,821.79
6. Step 6: Final answer
   x = 18,386.33