Finding the Fourth Proportional to 21,900.96, 30,223.32 and 12,469.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,900.96 : 30,223.32 = 12,469.50 : x
2. Step 2: Convert to fraction form
   21,900.96/30,223.32 = 12,469.50/x
3. Step 3: Cross multiply
   21,900.96x = 30,223.32 × 12,469.50
4. Step 4: Simplify right side
   21,900.96x = 376,869,688.74
5. Step 5: Solve for x
   x = 376,869,688.74/21,900.96
6. Step 6: Final answer
   x = 17,207.91