Finding the Fourth Proportional to 22,219.31, 30,665.99 and 12,786.05

Step by Step Solution

1. Step 1: Write the proportion equation
   22,219.31 : 30,665.99 = 12,786.05 : x
2. Step 2: Convert to fraction form
   22,219.31/30,665.99 = 12,786.05/x
3. Step 3: Cross multiply
   22,219.31x = 30,665.99 × 12,786.05
4. Step 4: Simplify right side
   22,219.31x = 392,096,881.44
5. Step 5: Solve for x
   x = 392,096,881.44/22,219.31
6. Step 6: Final answer
   x = 17,646.67