Finding the Third Proportional to 8,404.50 and 12,290.75

Step by Step Solution

1. Step 1: Write the proportion equation
   8,404.50 : 12,290.75 = 12,290.75 : x
2. Step 2: Convert to fraction form
   8,404.50/12,290.75 = 12,290.75/x
3. Step 3: Cross multiply
   8,404.50x = 12,290.75 × 12,290.75
4. Step 4: Simplify right side
   8,404.50x = 151,062,535.56
5. Step 5: Solve for x
   x = 151,062,535.56/8,404.50
6. Step 6: Final answer
   x = 17,974.01