Finding the Fourth Proportional to 21,882.72, 30,191.04 and 12,930.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,882.72 : 30,191.04 = 12,930.48 : x
2. Step 2: Convert to fraction form
   21,882.72/30,191.04 = 12,930.48/x
3. Step 3: Cross multiply
   21,882.72x = 30,191.04 × 12,930.48
4. Step 4: Simplify right side
   21,882.72x = 390,384,638.90
5. Step 5: Solve for x
   x = 390,384,638.90/21,882.72
6. Step 6: Final answer
   x = 17,839.86