Finding the Third Proportional to 121,945.50 and 279,067.50

Step by Step Solution

1. Step 1: Write the proportion equation
   121,945.50 : 279,067.50 = 279,067.50 : x
2. Step 2: Convert to fraction form
   121,945.50/279,067.50 = 279,067.50/x
3. Step 3: Cross multiply
   121,945.50x = 279,067.50 × 279,067.50
4. Step 4: Simplify right side
   121,945.50x = 77,878,669,556.25
5. Step 5: Solve for x
   x = 77,878,669,556.25/121,945.50
6. Step 6: Final answer
   x = 638,635.04