Finding the Third Proportional to 8,431.91 and 12,609.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,431.91 : 12,609.42 = 12,609.42 : x
2. Step 2: Convert to fraction form
   8,431.91/12,609.42 = 12,609.42/x
3. Step 3: Cross multiply
   8,431.91x = 12,609.42 × 12,609.42
4. Step 4: Simplify right side
   8,431.91x = 158,997,520.02
5. Step 5: Solve for x
   x = 158,997,520.02/8,431.91
6. Step 6: Final answer
   x = 18,856.64