Finding the Third Proportional to 12,986 and 21,100

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986 : 21,100 = 21,100 : x
2. Step 2: Convert to fraction form
   12,986/21,100 = 21,100/x
3. Step 3: Cross multiply
   12,986x = 21,100 × 21,100
4. Step 4: Simplify right side
   12,986x = 445,210,000
5. Step 5: Solve for x
   x = 445,210,000/12,986
6. Step 6: Final answer
   x = 34,283.84