Finding the Fourth Proportional to 22,405, 30,920.82 and 12,470.92

Step by Step Solution

1. Step 1: Write the proportion equation
   22,405 : 30,920.82 = 12,470.92 : x
2. Step 2: Convert to fraction form
   22,405/30,920.82 = 12,470.92/x
3. Step 3: Cross multiply
   22,405x = 30,920.82 × 12,470.92
4. Step 4: Simplify right side
   22,405x = 385,611,072.55
5. Step 5: Solve for x
   x = 385,611,072.55/22,405
6. Step 6: Final answer
   x = 17,210.94