Finding the Fourth Proportional to 21,752.12, 30,020.78 and 12,321

Step by Step Solution

1. Step 1: Write the proportion equation
   21,752.12 : 30,020.78 = 12,321 : x
2. Step 2: Convert to fraction form
   21,752.12/30,020.78 = 12,321/x
3. Step 3: Cross multiply
   21,752.12x = 30,020.78 × 12,321
4. Step 4: Simplify right side
   21,752.12x = 369,886,030.38
5. Step 5: Solve for x
   x = 369,886,030.38/21,752.12
6. Step 6: Final answer
   x = 17,004.60