Finding the Third Proportional to 143,691 and 308,707.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,691 : 308,707.50 = 308,707.50 : x
2. Step 2: Convert to fraction form
   143,691/308,707.50 = 308,707.50/x
3. Step 3: Cross multiply
   143,691x = 308,707.50 × 308,707.50
4. Step 4: Simplify right side
   143,691x = 95,300,320,556.25
5. Step 5: Solve for x
   x = 95,300,320,556.25/143,691
6. Step 6: Final answer
   x = 663,230.96