Finding the Third Proportional to 11,200 and 12,820

Step by Step Solution

1. Step 1: Write the proportion equation
   11,200 : 12,820 = 12,820 : x
2. Step 2: Convert to fraction form
   11,200/12,820 = 12,820/x
3. Step 3: Cross multiply
   11,200x = 12,820 × 12,820
4. Step 4: Simplify right side
   11,200x = 164,352,400
5. Step 5: Solve for x
   x = 164,352,400/11,200
6. Step 6: Final answer
   x = 14,674.32