Finding the Third Proportional to 67,005 and 138,870

Step by Step Solution

1. Step 1: Write the proportion equation
   67,005 : 138,870 = 138,870 : x
2. Step 2: Convert to fraction form
   67,005/138,870 = 138,870/x
3. Step 3: Cross multiply
   67,005x = 138,870 × 138,870
4. Step 4: Simplify right side
   67,005x = 19,284,876,900
5. Step 5: Solve for x
   x = 19,284,876,900/67,005
6. Step 6: Final answer
   x = 287,812.51