Finding the Third Proportional to 126,400.50 and 279,085.50

Step by Step Solution

1. Step 1: Write the proportion equation
   126,400.50 : 279,085.50 = 279,085.50 : x
2. Step 2: Convert to fraction form
   126,400.50/279,085.50 = 279,085.50/x
3. Step 3: Cross multiply
   126,400.50x = 279,085.50 × 279,085.50
4. Step 4: Simplify right side
   126,400.50x = 77,888,716,310.25
5. Step 5: Solve for x
   x = 77,888,716,310.25/126,400.50
6. Step 6: Final answer
   x = 616,205.76