Finding the Fourth Proportional to 21,902.72, 30,221.28 and 12,468.80

Step by Step Solution

1. Step 1: Write the proportion equation
   21,902.72 : 30,221.28 = 12,468.80 : x
2. Step 2: Convert to fraction form
   21,902.72/30,221.28 = 12,468.80/x
3. Step 3: Cross multiply
   21,902.72x = 30,221.28 × 12,468.80
4. Step 4: Simplify right side
   21,902.72x = 376,823,096.06
5. Step 5: Solve for x
   x = 376,823,096.06/21,902.72
6. Step 6: Final answer
   x = 17,204.40