Finding the Third Proportional to 42,689 and 66,970

Step by Step Solution

1. Step 1: Write the proportion equation
   42,689 : 66,970 = 66,970 : x
2. Step 2: Convert to fraction form
   42,689/66,970 = 66,970/x
3. Step 3: Cross multiply
   42,689x = 66,970 × 66,970
4. Step 4: Simplify right side
   42,689x = 4,484,980,900
5. Step 5: Solve for x
   x = 4,484,980,900/42,689
6. Step 6: Final answer
   x = 105,061.75