Finding the Fourth Proportional to 22,450.20, 30,978.87 and 12,378

Step by Step Solution

1. Step 1: Write the proportion equation
   22,450.20 : 30,978.87 = 12,378 : x
2. Step 2: Convert to fraction form
   22,450.20/30,978.87 = 12,378/x
3. Step 3: Cross multiply
   22,450.20x = 30,978.87 × 12,378
4. Step 4: Simplify right side
   22,450.20x = 383,456,452.86
5. Step 5: Solve for x
   x = 383,456,452.86/22,450.20
6. Step 6: Final answer
   x = 17,080.31