Finding the Third Proportional to 42,430 and 83,790

Step by Step Solution

1. Step 1: Write the proportion equation
   42,430 : 83,790 = 83,790 : x
2. Step 2: Convert to fraction form
   42,430/83,790 = 83,790/x
3. Step 3: Cross multiply
   42,430x = 83,790 × 83,790
4. Step 4: Simplify right side
   42,430x = 7,020,764,100
5. Step 5: Solve for x
   x = 7,020,764,100/42,430
6. Step 6: Final answer
   x = 165,466.98