Finding the Third Proportional to 19,770 and 42,810

Step by Step Solution

1. Step 1: Write the proportion equation
   19,770 : 42,810 = 42,810 : x
2. Step 2: Convert to fraction form
   19,770/42,810 = 42,810/x
3. Step 3: Cross multiply
   19,770x = 42,810 × 42,810
4. Step 4: Simplify right side
   19,770x = 1,832,696,100
5. Step 5: Solve for x
   x = 1,832,696,100/19,770
6. Step 6: Final answer
   x = 92,700.86