Finding the Third Proportional to 143,505 and 315,526.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,505 : 315,526.50 = 315,526.50 : x
2. Step 2: Convert to fraction form
   143,505/315,526.50 = 315,526.50/x
3. Step 3: Cross multiply
   143,505x = 315,526.50 × 315,526.50
4. Step 4: Simplify right side
   143,505x = 99,556,972,202.25
5. Step 5: Solve for x
   x = 99,556,972,202.25/143,505
6. Step 6: Final answer
   x = 693,752.64