Finding the Third Proportional to 401,709 and 550,831.50

Step by Step Solution

1. Step 1: Write the proportion equation
   401,709 : 550,831.50 = 550,831.50 : x
2. Step 2: Convert to fraction form
   401,709/550,831.50 = 550,831.50/x
3. Step 3: Cross multiply
   401,709x = 550,831.50 × 550,831.50
4. Step 4: Simplify right side
   401,709x = 303,415,341,392.25
5. Step 5: Solve for x
   x = 303,415,341,392.25/401,709
6. Step 6: Final answer
   x = 755,311.29