Finding the Fourth Proportional to 22,218.81, 30,665.30 and 12,785.55

Step by Step Solution

1. Step 1: Write the proportion equation
   22,218.81 : 30,665.30 = 12,785.55 : x
2. Step 2: Convert to fraction form
   22,218.81/30,665.30 = 12,785.55/x
3. Step 3: Cross multiply
   22,218.81x = 30,665.30 × 12,785.55
4. Step 4: Simplify right side
   22,218.81x = 392,072,662.49
5. Step 5: Solve for x
   x = 392,072,662.49/22,218.81
6. Step 6: Final answer
   x = 17,645.98