Finding the Fourth Proportional to 22,218, 30,664.56 and 12,784.80

Step by Step Solution

1. Step 1: Write the proportion equation
   22,218 : 30,664.56 = 12,784.80 : x
2. Step 2: Convert to fraction form
   22,218/30,664.56 = 12,784.80/x
3. Step 3: Cross multiply
   22,218x = 30,664.56 × 12,784.80
4. Step 4: Simplify right side
   22,218x = 392,040,266.69
5. Step 5: Solve for x
   x = 392,040,266.69/22,218
6. Step 6: Final answer
   x = 17,645.16