Finding the Third Proportional to 67,815 and 137,475

Step by Step Solution

1. Step 1: Write the proportion equation
   67,815 : 137,475 = 137,475 : x
2. Step 2: Convert to fraction form
   67,815/137,475 = 137,475/x
3. Step 3: Cross multiply
   67,815x = 137,475 × 137,475
4. Step 4: Simplify right side
   67,815x = 18,899,375,625
5. Step 5: Solve for x
   x = 18,899,375,625/67,815
6. Step 6: Final answer
   x = 278,690.20