Finding the Fourth Proportional to 20,636.32, 30,956.12 and 12,372.72

Step by Step Solution

1. Step 1: Write the proportion equation
   20,636.32 : 30,956.12 = 12,372.72 : x
2. Step 2: Convert to fraction form
   20,636.32/30,956.12 = 12,372.72/x
3. Step 3: Cross multiply
   20,636.32x = 30,956.12 × 12,372.72
4. Step 4: Simplify right side
   20,636.32x = 383,011,405.05
5. Step 5: Solve for x
   x = 383,011,405.05/20,636.32
6. Step 6: Final answer
   x = 18,560.06