Finding the Fourth Proportional to 20,581.98, 30,914.34 and 12,278.22

Step by Step Solution

1. Step 1: Write the proportion equation
   20,581.98 : 30,914.34 = 12,278.22 : x
2. Step 2: Convert to fraction form
   20,581.98/30,914.34 = 12,278.22/x
3. Step 3: Cross multiply
   20,581.98x = 30,914.34 × 12,278.22
4. Step 4: Simplify right side
   20,581.98x = 379,573,067.67
5. Step 5: Solve for x
   x = 379,573,067.67/20,581.98
6. Step 6: Final answer
   x = 18,442.01