Finding the Fourth Proportional to 22,380.94, 30,878.31 and 12,942.82

Step by Step Solution

1. Step 1: Write the proportion equation
   22,380.94 : 30,878.31 = 12,942.82 : x
2. Step 2: Convert to fraction form
   22,380.94/30,878.31 = 12,942.82/x
3. Step 3: Cross multiply
   22,380.94x = 30,878.31 × 12,942.82
4. Step 4: Simplify right side
   22,380.94x = 399,652,408.23
5. Step 5: Solve for x
   x = 399,652,408.23/22,380.94
6. Step 6: Final answer
   x = 17,856.82