Finding the Fourth Proportional to 22,216.56, 30,662.19 and 12,783.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,216.56 : 30,662.19 = 12,783.30 : x
2. Step 2: Convert to fraction form
   22,216.56/30,662.19 = 12,783.30/x
3. Step 3: Cross multiply
   22,216.56x = 30,662.19 × 12,783.30
4. Step 4: Simplify right side
   22,216.56x = 391,963,973.43
5. Step 5: Solve for x
   x = 391,963,973.43/22,216.56
6. Step 6: Final answer
   x = 17,642.87