Finding the Fourth Proportional to 21,904.24, 30,233.28 and 12,478.40

Step by Step Solution

1. Step 1: Write the proportion equation
   21,904.24 : 30,233.28 = 12,478.40 : x
2. Step 2: Convert to fraction form
   21,904.24/30,233.28 = 12,478.40/x
3. Step 3: Cross multiply
   21,904.24x = 30,233.28 × 12,478.40
4. Step 4: Simplify right side
   21,904.24x = 377,262,961.15
5. Step 5: Solve for x
   x = 377,262,961.15/21,904.24
6. Step 6: Final answer
   x = 17,223.28