Finding the Third Proportional to 67,851.75 and 137,620.50

Step by Step Solution

1. Step 1: Write the proportion equation
   67,851.75 : 137,620.50 = 137,620.50 : x
2. Step 2: Convert to fraction form
   67,851.75/137,620.50 = 137,620.50/x
3. Step 3: Cross multiply
   67,851.75x = 137,620.50 × 137,620.50
4. Step 4: Simplify right side
   67,851.75x = 18,939,402,020.25
5. Step 5: Solve for x
   x = 18,939,402,020.25/67,851.75
6. Step 6: Final answer
   x = 279,129.16