Finding the Fourth Proportional to 21,970.34, 30,321.24 and 12,540.32

Step by Step Solution

1. Step 1: Write the proportion equation
   21,970.34 : 30,321.24 = 12,540.32 : x
2. Step 2: Convert to fraction form
   21,970.34/30,321.24 = 12,540.32/x
3. Step 3: Cross multiply
   21,970.34x = 30,321.24 × 12,540.32
4. Step 4: Simplify right side
   21,970.34x = 380,238,052.40
5. Step 5: Solve for x
   x = 380,238,052.40/21,970.34
6. Step 6: Final answer
   x = 17,306.88