Finding the Third Proportional to 19,770 and 42,330

Step by Step Solution

1. Step 1: Write the proportion equation
   19,770 : 42,330 = 42,330 : x
2. Step 2: Convert to fraction form
   19,770/42,330 = 42,330/x
3. Step 3: Cross multiply
   19,770x = 42,330 × 42,330
4. Step 4: Simplify right side
   19,770x = 1,791,828,900
5. Step 5: Solve for x
   x = 1,791,828,900/19,770
6. Step 6: Final answer
   x = 90,633.73