Finding the Third Proportional to 143,309.25 and 309,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,309.25 : 309,964.50 = 309,964.50 : x
2. Step 2: Convert to fraction form
   143,309.25/309,964.50 = 309,964.50/x
3. Step 3: Cross multiply
   143,309.25x = 309,964.50 × 309,964.50
4. Step 4: Simplify right side
   143,309.25x = 96,077,991,260.25
5. Step 5: Solve for x
   x = 96,077,991,260.25/143,309.25
6. Step 6: Final answer
   x = 670,424.21