Finding the Third Proportional to 42,629 and 89,678

Step by Step Solution

1. Step 1: Write the proportion equation
   42,629 : 89,678 = 89,678 : x
2. Step 2: Convert to fraction form
   42,629/89,678 = 89,678/x
3. Step 3: Cross multiply
   42,629x = 89,678 × 89,678
4. Step 4: Simplify right side
   42,629x = 8,042,143,684
5. Step 5: Solve for x
   x = 8,042,143,684/42,629
6. Step 6: Final answer
   x = 188,654.29