Finding the Fourth Proportional to 22,164.47, 30,582.78 and 13,212.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,164.47 : 30,582.78 = 13,212.80 : x
2. Step 2: Convert to fraction form
   22,164.47/30,582.78 = 13,212.80/x
3. Step 3: Cross multiply
   22,164.47x = 30,582.78 × 13,212.80
4. Step 4: Simplify right side
   22,164.47x = 404,084,314.16
5. Step 5: Solve for x
   x = 404,084,314.16/22,164.47
6. Step 6: Final answer
   x = 18,231.18