Finding the Fourth Proportional to 21,974.12, 30,321.85 and 12,412.99

Step by Step Solution

1. Step 1: Write the proportion equation
   21,974.12 : 30,321.85 = 12,412.99 : x
2. Step 2: Convert to fraction form
   21,974.12/30,321.85 = 12,412.99/x
3. Step 3: Cross multiply
   21,974.12x = 30,321.85 × 12,412.99
4. Step 4: Simplify right side
   21,974.12x = 376,384,820.83
5. Step 5: Solve for x
   x = 376,384,820.83/21,974.12
6. Step 6: Final answer
   x = 17,128.55