Finding the Third Proportional to 19,800 and 42,030

Step by Step Solution

1. Step 1: Write the proportion equation
   19,800 : 42,030 = 42,030 : x
2. Step 2: Convert to fraction form
   19,800/42,030 = 42,030/x
3. Step 3: Cross multiply
   19,800x = 42,030 × 42,030
4. Step 4: Simplify right side
   19,800x = 1,766,520,900
5. Step 5: Solve for x
   x = 1,766,520,900/19,800
6. Step 6: Final answer
   x = 89,218.23