Finding the Third Proportional to 279,144 and 398,707.50

Step by Step Solution

1. Step 1: Write the proportion equation
   279,144 : 398,707.50 = 398,707.50 : x
2. Step 2: Convert to fraction form
   279,144/398,707.50 = 398,707.50/x
3. Step 3: Cross multiply
   279,144x = 398,707.50 × 398,707.50
4. Step 4: Simplify right side
   279,144x = 158,967,670,556.25
5. Step 5: Solve for x
   x = 158,967,670,556.25/279,144
6. Step 6: Final answer
   x = 569,482.67