Finding the Third Proportional to 20,690 and 43,300

Step by Step Solution

1. Step 1: Write the proportion equation
   20,690 : 43,300 = 43,300 : x
2. Step 2: Convert to fraction form
   20,690/43,300 = 43,300/x
3. Step 3: Cross multiply
   20,690x = 43,300 × 43,300
4. Step 4: Simplify right side
   20,690x = 1,874,890,000
5. Step 5: Solve for x
   x = 1,874,890,000/20,690
6. Step 6: Final answer
   x = 90,618.17