Finding the Third Proportional to 143,820 and 313,879.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,820 : 313,879.50 = 313,879.50 : x
2. Step 2: Convert to fraction form
   143,820/313,879.50 = 313,879.50/x
3. Step 3: Cross multiply
   143,820x = 313,879.50 × 313,879.50
4. Step 4: Simplify right side
   143,820x = 98,520,340,520.25
5. Step 5: Solve for x
   x = 98,520,340,520.25/143,820
6. Step 6: Final answer
   x = 685,025.31