Finding the Third Proportional to 67,978.50 and 137,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,978.50 : 137,855.50 = 137,855.50 : x
2. Step 2: Convert to fraction form
   67,978.50/137,855.50 = 137,855.50/x
3. Step 3: Cross multiply
   67,978.50x = 137,855.50 × 137,855.50
4. Step 4: Simplify right side
   67,978.50x = 19,004,138,880.25
5. Step 5: Solve for x
   x = 19,004,138,880.25/67,978.50
6. Step 6: Final answer
   x = 279,561.02