Finding the Fourth Proportional to 21,902, 30,230.16 and 12,476.12

Step by Step Solution

1. Step 1: Write the proportion equation
   21,902 : 30,230.16 = 12,476.12 : x
2. Step 2: Convert to fraction form
   21,902/30,230.16 = 12,476.12/x
3. Step 3: Cross multiply
   21,902x = 30,230.16 × 12,476.12
4. Step 4: Simplify right side
   21,902x = 377,155,103.78
5. Step 5: Solve for x
   x = 377,155,103.78/21,902
6. Step 6: Final answer
   x = 17,220.12