Finding the Fourth Proportional to 22,449.21, 30,981.72 and 12,379.60

Step by Step Solution

1. Step 1: Write the proportion equation
   22,449.21 : 30,981.72 = 12,379.60 : x
2. Step 2: Convert to fraction form
   22,449.21/30,981.72 = 12,379.60/x
3. Step 3: Cross multiply
   22,449.21x = 30,981.72 × 12,379.60
4. Step 4: Simplify right side
   22,449.21x = 383,541,300.91
5. Step 5: Solve for x
   x = 383,541,300.91/22,449.21
6. Step 6: Final answer
   x = 17,084.85