Finding the Third Proportional to 17,990 and 42,020

Step by Step Solution

1. Step 1: Write the proportion equation
   17,990 : 42,020 = 42,020 : x
2. Step 2: Convert to fraction form
   17,990/42,020 = 42,020/x
3. Step 3: Cross multiply
   17,990x = 42,020 × 42,020
4. Step 4: Simplify right side
   17,990x = 1,765,680,400
5. Step 5: Solve for x
   x = 1,765,680,400/17,990
6. Step 6: Final answer
   x = 98,147.88