Finding the Third Proportional to 67,067.50 and 139,642.75

Step by Step Solution

1. Step 1: Write the proportion equation
   67,067.50 : 139,642.75 = 139,642.75 : x
2. Step 2: Convert to fraction form
   67,067.50/139,642.75 = 139,642.75/x
3. Step 3: Cross multiply
   67,067.50x = 139,642.75 × 139,642.75
4. Step 4: Simplify right side
   67,067.50x = 19,500,097,627.56
5. Step 5: Solve for x
   x = 19,500,097,627.56/67,067.50
6. Step 6: Final answer
   x = 290,753.31