Finding the Third Proportional to 8,890 and 12,704.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,890 : 12,704.50 = 12,704.50 : x
2. Step 2: Convert to fraction form
   8,890/12,704.50 = 12,704.50/x
3. Step 3: Cross multiply
   8,890x = 12,704.50 × 12,704.50
4. Step 4: Simplify right side
   8,890x = 161,404,320.25
5. Step 5: Solve for x
   x = 161,404,320.25/8,890
6. Step 6: Final answer
   x = 18,155.72