Finding the Third Proportional to 143,086.50 and 308,488.50

Step by Step Solution

1. Step 1: Write the proportion equation
   143,086.50 : 308,488.50 = 308,488.50 : x
2. Step 2: Convert to fraction form
   143,086.50/308,488.50 = 308,488.50/x
3. Step 3: Cross multiply
   143,086.50x = 308,488.50 × 308,488.50
4. Step 4: Simplify right side
   143,086.50x = 95,165,154,632.25
5. Step 5: Solve for x
   x = 95,165,154,632.25/143,086.50
6. Step 6: Final answer
   x = 665,088.28